Aman Trivedi
Rubbing a piece of Sandstone paper around the door on the area where it's getting jammed can be helpful.
A Dehumidifier or a hair dryer can be used to dry moisture around a door as it can remove moisture and help in moving jammed doors.
Rub a dry and moisturiser-free soap at the edges of the door so that it leaves a powdery residue.
Getting the doors painted before the monsoon is a good idea to avoid this problem.
The use of Olive oil on the doors can prevent them from getting swollen by humidity and moisture.