Ajakstu Gul:
So I think what I was thinking was first roll was to try to crack it using blind stupidity, luck, shaking it, so forth, and second was using the finger-feel method suggested. Maybe. In either case it seems to be left for The Duke to bash it open.
Thank you for the explanation.
...Yeah, I think I'll rule that nothing bad happens to you (except for not getting xp), but that you fail to open the safe, too.