You said "front door" making me think it's a Travel Trailer with two doors, front and rear. Then "locked out" so only one door? If you CAN get in, you can dismantle the stuck lock from the inside, maybe with TORX screws. Maybe taking the inside handle off the screen door to help with access. Travel Trailer locks are cheap. Cheap to buy (around $30) but unfortunately cheaply made. My brother just had to replace one on his TT. Luckily one with two doors so he could get at the inner side of the lock and take it apart.
If you haven't left a window unlocked, this could get tough. A locksmith would probably drill it. I wonder if you took WD-40 with the "straw" on the can and flooded the thing, would it loosen up and give you One More Cycle...?
Hopefully one of our RV techs'll see this and offer a suggestion. Or an OP who's had the same issue. Speaking just for me, cheaper to hire a locksmith than repair an RV that got buggered up with amateur entry attempts.
And I'll offer this. When you DO get it open, don't give it a second chance. Replace it. You don't want to go through this again.
