I don't know if this is intended, but lockers seem to almost always be empty, with the only exception I've encountered being the locker on the small station I've typically started out at, which seems to always contain 3 spacesuits.
Also, when you walk into a locker, you will automatically attempt to unlock it. Even if you succeed, however, you will attempt to unlock it again despite already having unlocked it the next time you walk into it.