Before I moved to Somerset I lived well north of Birmingham ( better not be more specific) with a single letter post code. My neighbour had three successive break-ins which looked just like this. Although the damage appears superficial, it has damaged both door and caravan side panel - the latter being the expensive part.
After the second instance he left the door of his caravan unlocked ( it was parked at home, nd nothing of value left inside) the third instance proved that this was credit where it was not due.
Unfortunately it is illegal to apply voltage to the door.
(Should have said my neighbours idea was that the lowlife would have sufficient intelligence to try the door before forcing it. As I said above, he overestimated the possession of intelligence)