(Please move this question to the appropriate exchange site if it is not this one.)

In Danganronpa it appears that the lock at 9:27 in https://www.youtube.com/watch?v=qOVU8UZRrHc has a weird shape, and I cannot figure out how it might work. Using Google, it appears that these are locks for shoe lockers in Sentos, but I haven’t been able to find a picture showing how they work.

How do they work?

Update: After some more googling I found this auction: https://www.ebay.com/i/323002263864?rt=nc which has pictures of inside of the lock (and also pictures of the key, which are different from those in the game; I am now guessing that the key shape in the game probably does not exist, but only because I cannot come up with a lock mechanism for it). It does not explain how it works, though, and I am still interested in this.