I've had reasonable luck with spray grease (Lithium). Bend the nozzle 45 degrees so you can spray it into the *door check*. It may loosen things up enough to work for awhile longer.
Don't take it out, bite the bullet and buy a new one or head to the junk yard, they are kind of pricey.
If the door opens too wide it can stress the hinges and tear the sheet metal around the hinge. And might even open so wide it dents the fender or door (the sheet metal behind the hinge isn't all that strong).
Mine fell apart, the wife opened the door on a windy day, the door flew open and really farked some stuff up. I had to do some welding to put it all back together again.