He could have copies. That is why we all tell you to actually change the lock.
Yes & Yes.
You can do it yourself. Go to Home Depot or Lowe's.
All you need is a screwdriver or two provided you have standard sized holes in the door now.
Point of information.
For anyone needing to change locks.
These locks are expensive ($100-$125)
but they are great.
When I had a business, every time I changed employees, I changed locks.
With these I only needed to change codes.
If a friend needs to water the plants when you are away, you give them a code and then delete it when you get back.
And they are great for those people who are constantly losing their keys or locking them inside the house.
(Not too good for people who cannot remember their access code)
Schlage Home Security - Electronic Security