Idk if anyone said this yet, but lockpicking is a rather fascinating (and can be fairly academic if you make it) hobby, and most mass manufacture locks are shockingly easy to bypass with a simple pick and tension wrench

Edit: yeah filling the lock with cement or some other sabotage is probably actually a better idea. I think getting caught with a pick is a BIG no-no. Still I encourage everyone to pirate some lockpicking tutorial videos to check it out because locks really are pretty interesting