Hi i'm in the thieves guild the quest to open the 4 locked doors, but i can only use the lockpick skill 3 times then it no longer works at all, it does not matter if i use it to open 3 doors or try to open a door from a distance 3 times or anything, i just cant use the skill after 3 attempts, i've tried loading earlyer save games incase it was corupted but it still wont work more than 3 times no matter where i try to use it.