Sheesh... were renegades, rebels, and rogues, not human can openers.
But seriously, get some potions of master thievery (cost is steep, but it last for 12 hours, and you can make up the cost).
Spoiler
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> You should have found one when you escaped from the Jon Irenicus dungeon, from there you can pick them up in the copper cornet, and the rivalds market.
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Drink and be merry
Jimbo