Older doors, active businesses, and honest diagnosis
Established homes can have locks that have been changed more than once while the door and frame kept aging. If a key turns only while you pull on the door, say so. The cylinder may be fine while the bolt and strike are fighting each other.
For industrial or business addresses, provide the company name, suite, entrance, and on-site contact. A manager or authorized representative should be available. We can address the lock-related scope and explain when a broader door, frame, access-control, or life-safety issue needs another specialist.