The Stovebolt Site Forums The Shop Area Paint and Body Shop Doors 55 TF door alignment

I found this article on door adjustment. Paragraphs 5 and 6 say to use a block wrapped in a rag.

It seems like you could do the same thing by opening the door, hold the door against your leg, and pull at the top of the door.

Placing the block inside the door frame and bumping your hip/leg in on the middle/bottom will probably work better, though.