Sometimes I find that also loosening the back a bit (such as undoing the clips) will relieve the pressure and the crank will start turning normally again. But I try to do that in a dark place or a changing bag if possible.
I had a totally different problem with one of the first Fuji Pro colour neg films, that I put through my first Holga. Basically, I was out in very bright sunshine, taking pictures locally, when the actual back fell off of the camera and onto the ground, midway through the film. I picked up the back and replaced it and carried on. When I got home I put two elastic bands onto the body to stop this happening again in the future, and still do it.
I eventually sent the film off to a pro lab to d+p the film, thinking that I might be lucky to get one or two okay exposures, on the part of the film that had still been on the original left hand unused part of the film.
Now imagine my surprise when I received the prints and negs back, for all of the negs and prints were absolutely fine! They were some of the best prints that I've had printed, with the film being the main reason, I feel. They were full of colour, a good contrast and that lovely bit of out of focus area around the central sharp area.
With these, they became part of a talk at my photo club of the time, when this experience became part of the talk. Secretly I think, a couple of members must have been impressed and went on to buy a Holga.
Terry S