I will ask questions to gain as much information as I can about the service that is required, Pictures also help to diagnosis the problem.
Examples of knob and deadbolt designs
A rekey can be done to change the working key without changing the hardware. It can be done to reduce the number of keys on a key ring, Also it is usually cheaper than hardware change/replacement
Rekey Suggestion: Get at least one more key than you think you will need to keep in a safe as a original key to make copies from.
A hardware change examples:(knob to lever, knob to handleset, lever to handleset, double cylinder to single cylinder deadbolt) or changing from one manufacturer to another, example:(Yale to Schlage)
A hardware adjustment/upgrade examples:(strike or hinge adjustment,changing/adding more hinges or strike plates
A security assessment/audit survey looks for vulnerabilities in the security of a property examples: a deadbolt not fully extended, or a big tree near a door, door not closing fully.
A residential lockout is where you locked out of your own home (not vehicle).
Is to fix a problem. (example: latch not retracting properly)