Okay I have lived through this and replacing the seals does need to happen when this becomes a problem. However, seals going bad are not always the problem. Sometimes it is simply a matter of the seals or the metal they contact got wet while the doors are open then you close them and they freeze.
The down side here is this can also ruin the seals.
The hands down fix is one I tried on my wife's car a few years ago when we were having a colder than normal winter. After all the above trick only lasted a few weeks at a time lead me to experiment.
My best success by far was Painters Tape. You know the Green or Blue tape that peels off with ease.
- Prep was cleaning the painted metal in the door jam, I used paper towel with 409 or such cleaner and followed that with window clearer. I used the window clearer to remove any film left behind by the first cleaner.
- After I was sure the area was free off dirt and was nice and dry I applied the tape to the seal matting surface. Because of shape and curves of the door jam I found it best to apply the tape in three to eight in strips and yes ripping the tape is okay, I did as I didn't have scissors close by when I started. After applying the tape I ran my thumb over it to be sure it was stuck down completely.
When I decided to try the tape my concept was that the tape would be a better surface when moisture was an issue, and if it did freeze my hope was it would pull the tape loose allowing the door to open.
Well it never froze shut. One application of tape has been in place for going on three years. During that time or winters have been as low as -2 F and the door opens without effort.
Hope this helps.