I want to do this quest but the warehouse is lock...
In my pimary quest i am in the last quest....
Too many bug in this game

Make sure you don't go around the building and try to get in that door. It is messed up that the quest path leads you there, but you need to enter from the other side, right behind where the man and dwarf are standing by the guards. Basically 2 feet from where you picked up the quest.