The common causes of a sticking key, and which ones you can sort yourself.
A key sticks in the lock for a few usual reasons: a worn key, a dirty or dry cylinder, a misaligned door, or a failing lock mechanism. The fix depends on which one it is, and forcing or yanking a stuck key risks snapping it, which turns a small annoyance into broken key extraction.
Start with the simplest checks. A key that is a worn copy often binds, and a fresh cut through key duplication can solve it on its own. A dry cylinder benefits from a dry lubricant, not oil, which gums up over time. If the key only sticks when the door is shut, the door or strike is likely out of alignment, which is a lock repair rather than a lock problem.
If the key is good and the cylinder is clean but it still binds, the internal parts may be worn, and the lock is heading toward failure. At that point replacing the lock is the move, and it is a chance to add a stronger deadbolt. A key already snapped off needs extraction first.
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If you only take one thing from this, take this: handling a lock problem on purpose, before it becomes a crisis, is almost always cheaper and calmer than handling it in a panic at the worst possible moment. A little planning, a spare key, a rekey after a move, goes a long way.