A small observation can be useful.
Say whether the key enters normally, where the turn becomes difficult and whether the handle or latch moves as usual. Mention any difference you observed earlier between an open and a closed door; another test is not needed. Do not keep operating a failing lock to gather more detail.
The lock, its fitting and the way the door meets the frame can all affect the experience at the entrance. The actual cause needs checking. Neither the age of a Peachtree City home nor a photograph alone proves which part needs attention.
Repair and a change of key are separate aims.
A sound lock may be a candidate for rekeying when you want old copies to stop working. A lock that is damaged or unreliable needs a condition assessment as well. Explain both aims if they apply.
For an ordinary shop or office door, say who manages the entrance and whether other people share its keys. The business-door page covers the access arrangements that may affect a repair or change.
Identify the right door before the visit.
The keyed door beside a garage belongs in this conversation. The moving overhead garage door belongs to a different repair request. The residential garage-door page explains that distinction.
Give the actual address and entrance, then ask what inspection or work is proposed and what the charge includes. If you cannot use the entrance at all, say that at the start and read the access information.