Lockpicking.

The main reason people never want to cross me is because my dad's friend is a locksmith who taught me how to pick locks.  I can pick a lock within seconds.  Most of the time, anyway.  Usually I just need a paperclip or something, but some locks require me to use my locksmith tools.  I got those from the guy, too. You can only buy them if you're a licensed locksmith, but it's legal for me to have them because I didn't buy them.  If you ever need somebody to pick a lock, let me know.