Follow the motion in plain words
Describe the key first: does it enter, turn or stop partway? Then explain what the handle and latch do. Mention whether the door is open or shut and whether you can use another entrance. You do not need to repeat a failing motion to prove it. If a piece has snapped off, avoid adding another key or an improvised tool to the opening.
The door and frame matter too
A latch that misses its opening may involve the way the door sits rather than only the key cylinder. Say if the door has begun dragging, needs lifting or moves differently when closing. Use observations you already have; do not remove hardware to inspect it. Ask what can be assessed and retained, and let the proposed repair follow the actual fault instead of selecting a replacement from appearance.
Name the entrance before the hardware
A private unit door and a common entry can have different hardware and different people responsible for it. For a shop, specify the public entrance or staff doorway. The commercial service page covers that distinction. A powered communal parking gate needs its own capability check and should not be described simply as a broken lock.
Make the scope visible
Ask which fault the suggested work addresses and whether parts need replacing. If the key history also concerns you, mention rekeying as a separate goal. Confirm costs before additional work begins and ask how the repaired door will be checked. A clear finish means understanding both how the door operates and which keys should operate it afterward.
