I’m a huge fan of the Lockpicking Lawyer. He has a soothing voice and a methodical explanation around lock picking and functions. One such function is the devilishly simple “Hines Key System”. A simple set of groves to capture improperly raised pins that will jam a lock from opening if done improperly. Take a look:

Now, a cheap and easy modifiction to a common Kwikset lock that makes it work like the above: