On another site, I found this excellent animation to show how the inside of a pin tumbler works. Have a look! You can see at the start the pins cross the shear line and so the plug could not turn. When the key is fully inserted, the line separating the bottom pins from the drivers is flat with the top of the plug and so the key can now turn the plug. The rotation step is not shown here.
I found I had to open a tumblr.com account to post the image there as an animated GIF and link to it. I sent thanks to the GIF creator and you may follow the watermark to that blog if you wish but be warned, it is NSFW and has significant adult content.
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The contents of this post are released for non-profit or educational use in whole or in part provided this statement and the attribution below are kept attached.
Laux Myth ... Thoughts From a Locksmith
By MartinB, Found @ http://lauxmyth.blogspot.com/
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