Combination is L-R-L-R to stop.
Can you dial the combination or will the dial not turn?
If the dial turns then the door was rotated (while open) to the closed position and the dial was turned locking the door rotation.
If the dial does not turn then your door will rotate with the crank.
Both scenarios assume that one one was inside the door to mess things up or that there is a lock problem.
If you cannot get the combination to work the door cover can be removed to gain access to the lock or look for other problems. If the door rotates, screw it into the body close to the fully closed position. It probably won't close all the way until the mating surfaces are cleaned and polished. Then remove the lock screws on the door pivot bolts, back off the door pivot bolts to clear the cover and swing the door cradle away, remove the 4 bolts that secure the door cover and remove the cover. It's heavy and may have to be jiggled to get it off, don't drop it. Watch the small pinion gear that the crank goes on so it doesn't fall out. You then can access the lock. Here is the inside of the door.

If your door will not rotate you have a bigger challenge. You will have to rig the door somehow to hold it securely so that the cradle can be removed to allow the door cover removal. Be careful, the door is very heavy. I modified an engine stand to support the door when I had no option but to remove the door from a Victor cannonball.

When disassembling the door removed from the safe you have to be careful to keep the timing of the ring and pinion gears correct. There may be timing marks that can be aligned but one I had apart simply had a mark showing the top of the door when in closed position. There is a slotted keyed washer on the pinion shaft that must be aligned then the door is closed for the lock bolt to slide into.

One other thing to verify before ever fully closing any cannonball or screw door safe that has an internal time lock: make sure the tripping mechanism will not auto lock when the time lock is disabled or missing. It shouldn't be a problem on a Victor but is on a Mosler. You do not want to here a death click upon closing the door.
If you remove the door pay attention to the height of the door in the cradle so that you can get it adjusted back close to the original position. Once you get it close enough to fit the opening there is a process to adjust these doors for final fit.