Locks are about 4,000 years old, and every major change in how people live together, from the first cities to Los Angeles apartment buildings, has leaned on them. This is a short history of locksmithing and what it says about the deadbolt on your door today.
Wooden pins: the first 3,000 years
The oldest lock we know of came out of the ruins of Nineveh, in what is now Iraq, and it is a wooden pin tumbler. A wooden bolt slid across the door; pins dropped from above into holes in the bolt and held it. A large wooden key with matching pegs lifted them and freed the bolt. Egyptian tomb paintings show the same mechanism. It was slow and bulky, but the idea, movable pins that block a bolt until the right key lifts them, is the idea inside the cylinder on almost every front door in Mid-Wilshire.
The Romans made locks smaller and switched to metal, with iron bolts and bronze keys small enough to wear as rings. Roman warded locks used fixed obstacles inside the keyhole that only a key with matching cutouts could pass. Wards were easy to defeat with a skeleton key, but they were cheap, and for the next 1,500 years most of Europe’s chests and doors relied on them.
The 18th century arms race
Serious lock design restarted in England as trade and banking grew. Robert Barron patented the double acting lever lock in 1778: levers had to be lifted to an exact height, not just past a minimum. Joseph Bramah followed in 1784 with a lock so intricate that he put it in his shop window with a sign offering 200 guineas to anyone who could open it. Jeremiah Chubb added the detector lever in 1818, which jammed the lock if any lever was lifted too far and showed the owner that someone had tampered.
Bramah’s challenge lock stood for 67 years. In 1851, the American locksmith Alfred Hobbs opened it at the Great Exhibition in London over 51 hours, and picked Chubb’s lock in about 25 minutes. The public reaction is familiar to anyone who has read about a smart lock exploit: shock, then a wave of better designs. Hobbs’s own summary is still quoted in the trade: a lock is a puzzle, and a puzzle always has a solution; the question is how long it takes.
Linus Yale and the lock in your pocket
Linus Yale Sr. patented a pin tumbler bank lock in 1848, taking the Egyptian principle and building it in metal. His son, Linus Yale Jr., refined it through the 1860s into the small cylinder with a flat, serrated key that anyone would recognize today. The cylinder could be made on machines, keyed in thousands of combinations, and swapped out without replacing the whole lock body.
That last detail changed housing. A landlord could rekey between tenants instead of buying a new lock. Hotels could give each room a different key and a master to staff. Apartment buildings, which were spreading in American cities from the 1880s, became practical to manage. The courtyard apartments and duplexes built across Koreatown and Mid-Wilshire in the 1920s were designed around the Yale cylinder and the master key system, and many still run on them.
Locks and the shape of cities
Before reliable locks, valuables were guarded by people: night watchmen, servants, family members who stayed home. A lock that could be trusted for a few hours freed those people for other work. Warehouses could hold goods overnight with a watchman instead of a crew. Shops could close. Banks could hold deposits in a vault rather than a strongroom with guards. Economists describe this as lowering the cost of protecting property, and it shows up in how commercial districts grew along streetcar lines and later along boulevards like Wilshire, where a storefront could be secured by one door and one gate.
Privacy changed too. A lockable bedroom door is a 19th century middle class development. Diaries, letters and personal money lived in locked boxes. The expectation that a home is private space that others cannot enter without permission is, in a practical sense, an expectation that locks made possible.
Cars, keys and a new trade
The automobile created a second branch of locksmithing. Early cars had no locks at all; the ignition switch key arrived in the 1910s and door locks followed. Los Angeles, built around the car from the 1920s onward, produced a specialty of automotive locksmiths long before most cities. Transponder chips arrived in the mid 1990s in response to a wave of hot wiring, and within a decade a lost key went from a two dollar copy to a programming job. Today a locksmith who works on cars carries diagnostic equipment that talks to the vehicle’s computer; the trade’s history of answering each new attack continues on the OBD port. If you are curious how that works, read how a car key is programmed without the original.
Standards and grades
As locks became mass produced, buyers needed a way to compare them. In the United States the ANSI/BHMA grading system rates locks by cycle count and resistance to force, from Grade 3 (light residential) to Grade 1 (commercial and high security). Underwriters Laboratories’ UL 437 standard tests cylinders against picking, drilling and other attacks. Those standards are why a locksmith can tell you that a $25 deadbolt and a $250 deadbolt are not the same product even though both fit the same hole. Our comparison of high security locks explains what those grades mean in practice.
Electronics, and the return of the same problems
Keypads, card readers and smart locks are the newest chapter, and they follow the old pattern. Each solves a real problem: codes can be revoked without a rekey, access can be logged, keys stop being copied. Each has introduced new attacks: default codes never changed, Wi-Fi bridges on open networks, fobs relayed from a front hallway to a driveway. And nearly every electronic lock still has a mechanical cylinder, a bolt and a strike plate underneath, which fail or wear like any other. The locksmith’s work has shifted rather than disappeared, as our post on biometric versus traditional locks discusses.
What 4,000 years of locks say about your door
- Every improvement answered a specific attack. Pick the hardware that answers the attack common where you live: copied keys in an apartment building, kicked frames in a detached house, smashed glass at a storefront.
- The bolt and the frame matter as much as the cylinder. Hobbs picked Bramah’s lock, but most burglars never pick anything; they push, pry and kick. A reinforced strike with 3 inch screws answers the actual threat.
- Key control is old and still the point. The Yale cylinder made rekeying cheap so owners could know who held keys. A move-in rekey in Los Angeles costs $120 to $250 and does exactly what it did in 1870.
- Standards beat marketing. Look for the ANSI grade and UL listing, not the packaging.
If you want to see the history in person, the older homes around Hancock Park and Los Feliz still carry 1920s mortise locks that work after a century with a cleaning and a rekey. We are fond of them. Our residential locksmith team services and rekeys original hardware rather than replacing it whenever the door allows, and our guide to door types and keys shows what you might find in a Los Angeles home of any era.
Locksmith Liberty: the trade, practiced in Los Angeles
Locksmith Liberty is a licensed mobile locksmith based at 5700 W Olympic Blvd #222 in Mid-Wilshire, working across Los Angeles 24 hours a day on homes, businesses and vehicles.
- Rekeying and repair of vintage mortise locks and modern cylinders
- High security and restricted keyway installations
- Keypad, smart lock and access control installation
- Car key cutting and programming at your vehicle
Call (213) 314-1971 or use the contact page. Our office is at 5700 W Olympic Blvd #222, Los Angeles, CA 90036, and a technician can usually reach Mid-Wilshire, Koreatown, Hollywood, Beverly Grove and Culver City within 20 to 40 minutes.
Service pages: commercial locksmith, automotive locksmith, and our Mid-Wilshire and Hollywood coverage areas.
Lock history FAQs
When was the first lock invented?
The oldest known lock is a wooden pin tumbler from Nineveh in the Assyrian empire, roughly 4,000 years old. Egyptian examples from the same era used a wooden bolt with pins that dropped into it, lifted by a large wooden key. The principle survives in the pin tumbler cylinder on most Los Angeles front doors.
Who invented the modern pin tumbler lock?
Linus Yale Sr. patented a pin tumbler design in 1848 and his son Linus Yale Jr. refined it in the 1860s into the small flat key cylinder still in use. Robert Barron (1778) and Joseph Bramah (1784) in England had earlier built the lever and the high security locks that the Yales were competing with.
How did locks change cities and commerce?
Reliable locks made it possible to store goods and money away from constant guarding, which allowed warehouses, banks and shops to operate with fewer people. Mass production after 1850 made a good lock affordable for ordinary households, which shaped how apartments, hotels and offices were designed.
What does lock history mean for securing a home in Los Angeles today?
Every advance came in response to a specific attack, and that pattern continues. Bump keys pushed the market to high security cylinders, and copied keys pushed it to restricted keyways and keypads. Choosing hardware that answers the attack common in your neighborhood, not the newest gadget, is the lesson.
Are smart locks the end of mechanical locksmithing?
No. Nearly every smart lock still has a mechanical cylinder, a bolt and a strike, and those fail or need rekeying the same way. A locksmith’s work has shifted toward installing, programming and integrating electronic hardware alongside traditional keying, rather than being replaced by it.
