Be Aware Picking A Standard Yale Lock Is Not A Major Challenge

First, let's understand how a lock works. I'll only be talking about the common pin-tumbler lock (commonly referred to as a Yale lock, after its inventor in 1860). This is the kind you possibly have on your front door, with a key having a series of mountains and valleys of various heights. While your key may slide into other locks, the height of those bumps determines whether or not it will turn.

Brass pins keep the lock cylinder from whirling and un-latching the door. Each pin is in two parts, and has to be lined up precisely for the cut in the pin to adjust to the edge of the turning cylinder. If even one of those pins (most locks have five) is too high or too low the pin is going to bind and hamper turning.

The right key matches the cuts in the pins to set everything in alignment. If you've ever handled an old lock, or a poorly cut key, you may have had to jiggle the key to get the lock to work. That's in fact very much like the process of picking a Yale lock.

Basically, finding out how to pick a Yale lock you randomly move the pins up and down until you get them to the suitable height. However, if they move freely up and down it seems unlikely that you'll eventually find them all aligned at once. In case you did, you would not know if you didn't turn the lock then. So, step one of picking a lock is to apply some torque.

You turn the cylinder of the lock, rotating it with a small screwdriver, so that the pins are squeezed against the chamber walls. Now, with friction the pins will not go freely up and down, however can be moved by tapping slightly with your lock pick. (an advanced lock pick will have a small steel spring attached so that you can 'twang' it and create a subtle tapping motion).

The torque should secure that in position when you move to the second pin, and so on.

For any modern day Houdini picking a standard Yale lock is not too big an issue, which is why many apartment buildings and companies use more advanced locks (for instance Medeco brand). These require precise pin rotation as well as height.

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