The doors by themselves cost a pretty penny. You don't want to have to replace one.
I don't know what the locks look like but I'm sure a locksmith can open it easily. If you're in a hurry, I bet it could be drilled out, just the keyhole and tumblers, and then turned with a screwdriver to open. If it can wait, you might see about getting a key from a dealer or the manufacturer.
03 Itasca Sunova, Workhorse P32 with the 8.1 and 4L85-E