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Be Cautious Picking A Standard Yale Lock Is Not A Major Task
First, let's understand how a lock works. I'll only be talking about the common pin-tumbler lock (usually referred to as a Yale lock, after its inventor in 1860). This is the kind you mostly have on your front door, with a key containing a series of mountains and valleys of various heights. While your key may go into other locks, the height of those bumps determines whether or not it will turn.
Brass pins stop the lock cylinder from whirling and un-latching the door. Each pin is in two parts, and should be lined up accurately for the cut in the pin to match the edge of the turning cylinder. If just one of those pins (most locks have five) is too high or too low the pin will bind and hamper turning.
The right key aligns with the cuts in the pins to set everything in position. If you've ever seen an old lock, or a badly cut key, you may have had to jiggle the key to get the lock to work. That's actually very much like the process of picking a Yale lock.
Basically, understanding how to pick a Yale lock you randomly drift the pins up and down until you get them to the proper height. Nevertheless, if they move freely up and down it seems unlikely that you'll suddenly find them all aligned at once. In case you did, you would not know if you didn't turn the lock at that time. So, step one of picking a lock is to put some torque.
You turn the cylinder of the lock, winding it with a small screwdriver, to ensure that the pins are squeezed against the chamber walls. Now, with friction the pins will not slide freely up and down, however can be moved by tapping slightly with your lock pick. (a professional lock pick will have a small steel spring included to help you 'twang' it and cause a subtle tapping motion).
The torque should hold that in position when you shift to the second pin, and so on.
For any current Houdini picking a standard Yale lock is not too big a problem, therefore many apartment buildings and offices use more advanced locks (like Medeco brand). These require accurate pin rotation combined with height.
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