Always try to do this with the character who has the most Strength (you will notice that there is a substat that depends of STR that reads Open Doors). Well that is the probability of opening a certain locked door/chest.
It is always best if you try and open doors/chests by picklocking them rather than bashing them open. Firstly, because they yield XP. Secondly, because it is much harder to do it by brute force. If you dont have a thief and you desperately want to open a door/chest and you cant, you can always use a Giant Strenght potion, or a Spell (the mage has a second level one, I think).
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