I use normal triangle paper clip, no twisting or bending required.
Just insert & twist to the opening direction while jingle up and down, and the lock is opened within 5 minutes once the tumbler is set.

If got similar keys, even easier.
Same method as above, and it can be opened too within 5 minutes.

I already demo to my office colleagues on the cabinets & office block mailbox using only 1 triangle paperclip when they lost the keys.
Also able to open my friend's house computer room which he accidentally locked with this method using a similar fit key since he don't actually have the room key.

Locksmiths also use this same technique too with custom tools, so they can open the locks even faster than me.