For all of us the one thing that stands between our loved ones and valuables is most often just a good solid set of locks on all of the doors in our homes. Locksmiths ply their trade to let us back into our homes whenever we loose our keys.
Like with all other sources of technical knowledge, the skills of a locksmith can also be used for unlawful purposes.
Since most locks are based on pretty similar concepts, you would be surprised how easy it is for someone to learn how to compromise a lock, especially with the Net being full of how-to guides on the subject. If you don't believe me: The MIT Guide.
As I have said before, one of the easiest ways to defeat a home burglar is to learn how they think, and familiarize yourself with the techniques they use to victimize you. In any event, it is an eye opener so see for yourself how vulnerable you really are.
Alternatives to this home security vulnerability is to get a keypad entry system, use home safes or diversion safes and install a video surveillance system.
Another thing you can do is to install high quality pick proof locks on your home.