When I worked in construction we had door knobs like these at my office. I LOVED them.
I didn’t have to keep straight who I had given keys- people had codes to get in. And if we needed to change the code it just took a few minutes.
I have often thought about putting them on my home but they are so expensive!
Today on Amazon they have a great selection  with good feedback for less than $100!
These are a Deal of the Day so they will not be on sale for long- check them out now if you need them for your home or office!