Is your lock a Trimark?
If it is the striker connection is made out of pot metal and it has broke off inside the lock and the dead bolt is out locking the door permanently.
You have to take the lock out from the inside and it is NOT an easy thing to do. Trimark now does make a "better", "improved" version that won't break but sadly that will not help you right now. :(
I took mine out took out the broken part and only use one of the locks now.
This is a VERY COMMON occurrence with Trimark. My advice for others is to NOT use the lock on the pull handle, only use the lock with the square key and tape off the opening for the other lock in case someone does use it. Because it's an accident waiting to happen and it will happen. Just saying.
Oh BTW.....this is the SECOND lock that has broken for me. The original lock that came with RV broke off AND the second new one I had installed while on the road that when all was said and done with that service call and second lock cost me $500.00.