@PawelK Those paw type latches are really easy to get out of alignment or something bends. A half circle pick works wonders on the wafers but a good hook will work well too.

I want to say it's 4 or 5 wafers by the key hole shape. I usually just use graphite powder on stubborn locks. The rotating paw mechanism is more robust and can handle more damage than the other designs. I've seen where people tried to force them open and the paw had partially ripped through the sheet metal.

Locks are lovely.