Sorry to hear the door is in the locked position. This means you will probably find out (to your horror) how easy it is to break into your van, and no, I am not a caravan thief, but I did have a break in on one oaccasion while parked ina supermarket in France. The thieves were inside in less than a minute. So much for security.
But I suspect that you could probably open one of the windows in a few seconds with a slim piece of steel, and of course if you have an under bed locker hatch you can always send the wife into the van that way. Assuming she is slimmer than you of course. I discovered on an expensive motorhome I once owned that the actual tongue of the door lock only extended about 3/8 th of an inch over the door jam, so it would not take too much effort to force it.
Anyway, the dealers probably have some smart way of solving things for you, and I hope it all works out well.