I'm pretty sure pirates should be able to unlock a lock. My pirates aren't exactly that skilled in that area, so we decided to practice.
I placed 3 locks and 3 keys on a tray for Princess to match and then unlock the locks:
I quickly found that doing so was way beyond her level. So I put the keys in the locks for her and she practiced using her wrist to unlock them.
Notice she's wearing some of her treasure.
She had success s few times on her own, but this is a skill that needs more attention in the future. Im going yo wait a bit because she became frustrated at times when the "key wasn't working".