a couple of things. for those with the vintage like mine, the early 1990's, the filing of the door and repainting fixes the problem. i know it sounds devastating to be filing the door down, but just do it slowly and repeatedly until the door doesnt stick. i did it over a week period or so, using touchup paint each time on the edge to be able to see where it was scraping off when the expansion was the most in full sun in the morning.
my door has foam weather stripping around it as well. i replaced it and it is a little thicker which makes my door and locking a little harder than it was. so if you have to push your door with your shoulder and it isnt from touching metal on the door and the frame, then check your weatherstripping as well.
later
tom
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