So if he's just robbing someone why would he care if he busted the lock? Like people said, screwdriver + hammer. People gotta use their heads.
They sure do! Dude could be stealing from a housemate, like his parents. It would be necessary, then, not to smash the safe up.
OP, don't go busting up your parent's safe. There is nothing interesting in there. It most likely contains their home made porn collection.