In that particular area, you can pound it out, pull it out, whatever works for you. But the shrinking is the problem. The actual door jamb was pulled forward at the time of the crease damage, so now you have to pull it back into place to get the panel right and to reduce the amount of shrinking required. That is pretty hard to do in that area without following Carl's method. Not a good way to get a dolly in behind so you can shrink it.
It's like Carl said, a Makita with a thin grinding wheel, cut the crease and weld it shut again will resolve the problem. Once it's opened, pulling the door jamb back is easy.
I use a stud gun for this and once it's pulled close, studs with a slide hammer on the door jamb relieves the pressure. In any case, it ruins the paint job.
