This really depends on the door. If it's a wooden door, a lot of strong shoving at the jammed spots will be needed from the correct side. But consideration must be given to shaving the door in order to close it again.
Jammed upvc doors need to be spread enough to access the mechanism - best done by a pro.
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LondonLocksmith247 locksmith sutton are fully qualified, experienced and made a lock change on my door. That means faster response times and local knowledge you can trust. They understand the urgency of lockouts, and their goal is to get you back inside quickly and safely, with minimal damage to your door. These are really the only suggestions I can make without seeing the lock or knowing what kind of lock it is that's stuck.
You could lubricate the lock, either in the keyway if the key is getting stuck, or by the latch / bolt, if that's the part that's stuck. If you have access to the screws, you can take it partially apart and either manually open the door with a tool (such as a screwdriver), or lubricate the inside mechanisms.