I always use the lockers in a specific part of the locker room and since we’re meant to bring our own padlocks I just look for mine. No need to memorise anything.

Which btw made me realise cheap padlocks all open with the same key - imagine my surprise when I opened a locker that had the same padlock as mine with my key and found that the stuff inside was not mine. Mine was a couple lockers next to it!