Lock picking can be a very useful skill to have. It requires practice, finesse, practice, the right tools, and more practice. You can’t buy practice or finesse but you can buy tools. TOOOL has designed a particularly clever set of lock picking tools called the TOOOL Credit Card Pickset.
This clever credit card sized piece of metal contains an entire pickset complete with picks, rakes, and tension wrenches (the frame). There are two versions which are both available at the link. V2.0 looks like the pick of the liter.
Disclaimer – Jerking the Trigger does not advocate using these for anything illegal. Never pick a lock that the owner has not given permission for you to pick. Check your local laws before carrying these tools.