If you have a neighbor with a trailer or RV, or are close to an RV lot, try to borrow their keys. RV locks aren't too sophisticated, many locks open with other keys. Have you tried sliding all windows to see if any are unlocked? You could crawl in or boost a kid into the window.
If you're a member of Good Sam, AAA, etc. you could call for roadside assistance. Third suggestion would be to call a locksmith.
Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI