Oldsarbouy
The door was not supposed to be operated at all when refuel/defueling. You can open it before or after though, which was the norm down route at least.
I had a similar problem on route. Tried the tow/jump on the wing/move the pallets around/use locking wire to pull the lock in/shift fuel around and simply kick the door outside to no avail. Finally got it to work by taking all the load off the pallets, closing the door and hand load the pallets back on
(We had a plane load of rather large built squaddies to assist)!
Had another occasion where taxiing right out of the parking slot at Deci and motoring the final few inches shut worked!!!!