\"Treasures\" Miller of pawns (Kingdom Come: Deliverance)

Good night!
Tell me, please... at what level of opening locks we can open the barn Miller of pawns, where he keeps his money?
I now have 13 and a half level, almost 14, but it's still coming in the door with it very difficult lock the game says this lock is too difficult for you.
In General, there are very difficult chests that can be hacked and which is not.
What level do you can hack all the locks in the game?)
Thank you!