A1: Its a lock pick for doors a default tool in your inventory,just walk upto a door an onscreen prompt will let you know if the door is locked,if so scroll down with your controller to the option you wish to use/pick-lock etc,then manouvre your stick around to the outsides of its reach till you hear/feel the click this will undo one of the pins,you can watch it onscreen moving up/down whilst attempting to to spring the pin open with your controller stick.the locks vary some 2 pins or more etc,just a question of wiggling it in the correct quarter..easy...