I have just noticed the
locks (?) on these look almost identical to my work locker lock barrel. I forgot my key a couple of weeks ago, and being impatient (I could easily have waited until the next day lol) I opened up a heavy paperclip, folded it over and inserted the two legs into the lock. Wriggled it up and down, twisting slightly and the barrel came out. It allowed me to insert my car key into the mechanism and turn it, to open. (reinserted the barrel by using the key the next day)