How does a Pin Tumbler Lock work?

We use keys and locks all the time - but how do they work? There are many different kinds of locks but the most common is called a Pin Tumbler Lock.

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Sources for this video:
The Complete Book of Locks and Locksmithing by Bill Phillips: http://amzn.to/2yNkYIx
http://www.explainthatstuff.com/yalelock.html
https://www.youtube.com/watch?v=mO3mMYwKkKs

Music:
Deliberate Thought by Kevin MacLeod is licensed under a Creative Commons Attribution license (https://creativecommons.org/licenses/by/4.0/)
Source: http://incompetech.com/music/royalty-free/?keywords=deliberate+thought
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