Is there a keyless lock that requires only replacing a doorknob?

I'm looking for a key less lock such as a combination lock for a door. The door only has one hole from the one doorknob and I can not drill or make any more holes. So is there a lock that can be used with just one hole? I found one called gsa which has four turn dials in the knob but I known those types can easily be opened by looking in between the wheels and matching the numbers.