Not having put a handbrake on fully when on site is one cause I know for jambing up the likes of Al-KO Secure wheel locks.
The lack of the full potential of the handbrake can allow the van to ease against the wheel lock and that in turn can side load the lock's screwed bolt.
If the lock lozenge can't rock because of this, then I recommmend you use the mover to ease the loaded spoke off the lozenge, till it can rock on its clearances.
Together with the owner, I had a hell of a struggle helping someone who had no mover, get out of that predicament after his failed attempts had damaged the special profile socket that drives the bolt.