You have to turn a doorknob in order to pass through a door, so a doorknob in a dream can symbolize an action that you have to perform before you can move on to a new stage in your life.
The doorknob in your dream can represent a “turning point” in your life.
Turning a doorknob in a dream can represent finding a new way of obtaining information. Perhaps you should try looking at things from a different perspective.
A dream that you are unable to turn a doorknob can mean that you are going about solving a problem the wrong way. Try to find another approach.
A stuck doorknob in a dream can represent a real life obstacle.
Fitting a doorknob onto a door may mean you must sole a basic problem before you can continue.
In a dream, a doorknob can be a male sexual symbol.