If your lock is a Trimark run don't walk to get a new lock.
Because that is the first symptom that the pot metal they use in the lock mechanism is cracked and it WILL break and you will be locked out or locked in for that matter.
Replacement lock isn't cheap but I ended up paying over $500.00 to get back into my RV while on the road. And almost all locksmiths hang up on you when you say the word RV lock.
Do a search there were plenty of threads about it.
AND
The replacement ones have the same damn pot metal inside them. :R
They have come out with some sort of replacement for the pot metal but the locks on the shelf are STILL pot metal.
I know I had to replace the replacement.:M
I got so made I took the replacement lock apart which is by no means easy or meant to come apart and removed the whole second lock, taped the hole for it and taped the opening in the door. I now just have the deadbolt working.