The crowbar was usefull when you got into the arena. You could block the doors of the cages with that in order to avoid to fight the spiders and take the items that were placed infront of the cages´ doors. Now it has no use. Drop it.
Till lockpick skill is fixed try to unlearn this skill (if you have the money that is) and learn another skill which will work. You will probably need all your skills in the following acts. In my case I had to pay 2.700 gold pieces to unlearn the two skill points I have invented in Lockpick.
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