Bump keying
Bump Keying is a very simple locking picking technique working on at least 90% on all pin locks. All you need is an easy-to-obtain bump key that when placed in a lock and lightly bumped a few times, will move the internal pins of the lock and open the lock.
Clippings 
None
September 9, 2006 at 8:32 am
Yes - a little to simple.
What makes it easier ( or more scary if you want to talk about it) is that sites like http://www.bumpkey.us actually sell them to anyone. Makes you wonder what joe public is going to use them for.
September 10, 2006 at 11:28 am
http://www.cheapbumpkeys.com/
That site is selling them even cheaper.
It’s an astonishing thought that anyone with $9.99 can break into millions of homes in America without even leaving a trace.