The door you walk through.
The ordinary pedestrian door between the garage and the house, or beside the driveway, can have a key, handle and latch. A key that catches or a handle that feels loose belongs in a lock-repair request. If you are unable to use the entrance, explain that at the start.
If the hardware works normally but old copies should stop operating it, ask whether it is suitable for rekeying. That is an access decision, rather than a diagnosis of a moving door.
The door that moves above the driveway.
A sectional or overhead garage door has a different repair question. Describe a stop partway, uneven movement, an unexpected noise or a change in response. Do not keep operating it to collect a better description.
Keep the opening clear and stay away from springs, cables and moving parts. The private residential garage-door repair page explains what information helps without asking you to take anything apart.
Explain how the household normally gets in.
In a home where the garage is the usual entrance, the two doors can feel like one route. Mention whether another authorized entrance is available and which part is preventing normal use. Avoid unsafe climbing or trying to move a failing door yourself.
Give the property address and say whether the problem concerns a key, the pedestrian door hardware or the moving garage door. If the description is still uncertain, explain it in your own words. The FAQ and contact information can help organize the rest.