The roadside assistance programs also offer "lock-out" services. I know this because we locked outselves out of our van twice and both times someone came out to get us back in.
One of those places was in a remote campground way up in the UP of Michigan.
Don't know how we would have gotten back in without that service.
Marilyn w/ Joe, 2016 Class C Sunseeker 2430 SF, often pulling a Ranger bass boat. Traveling with Trigger
Smudge & Gizmo are waiting at the Rainbow Bridge