You might try a good quality oil and squirt a little into the lock cylinder then put some on the key and work the key in and out of the lock until it goes in and out freely. Then work the key side to side without forcing it. I have done this with several locks and it has worked well. I have also done this with frozen vehicle door locks after ice storms when water has gotten into the cylinders.
I use
Break Free CLP gun lubricant. The 2 or 4 oz size has a small plastic applicator tube that inserts into the bottle tip.
Can you get in the trailer through a baggage door? Do you have a kid or maybe a neighbors kid who could get in that way and unlock the door from the inside?
There are 3 screws that can be removed from the lock assy on the inside of the trailer. After that everything should come apart enough to gain entry.
I was having trouble with my locks and replaced the entire lock and latch assy. The dead bolt was frozen (luckily in the unlocked position) and I was having trouble getting the key in and out of the other cylinder although it was still working.
After replacing the lock assy I used the Break Free like mentioned above but also had to apply some to the back and sides of the cylinder for the dead bolt and everything finally freed up. The trailer is 8 years old and the lock assy is the original. I'll probably save it as a spare.
There is a
recall on the FIC locks involving the lock cylinders.
