If you shim the door, shim it on the inside of the door, lower most hinge, very bottom bolt. Mine only need 1 shim 1/16".
Most body shops have a special tool which cracks open thr door slightly, one part connects to the stricker, the other part connects to the latch. Theres a handle on this tool, you use up body weight to tweek it back into shape. You can only do this a few times though. I've done my door twice this way, lasts about a couple years before needing work again. This last time (a few months ago) There was no more tweeking that could be done, a shim was the only solution other than replace the hinges (since there not rebuildable like on other vehicles). The shim worked great, was easy to do, and no one knows its there. This should last a few years, longer than the other method. When it sags again, i'll opt for some new hinges. I'll be well into the 200,000 mile range then....