Pad locks and door locks are challenging puzzles to solve. The pick tools require finesse, and lock picking requires patience and acute concentration. Sounds like a fun new hobby, and the skills you acquire from it could come in handy in an emergency. Or, if you like working with tools in general, you might take it a step further and take a locksmith certification course; the locksmith industry is suffering from a recent trend where shady operators charge way too much for bullshit work, or are criminals outright who pass copies of the new keys to burglary rings.