If you are turning the knob, it shows how you are dealing with the issues in your waking life. If it works smoothly, you are going great. The knob also represents you confidence and self-trust while entering the new phases of your life. The knob may symbolize your desire for better knowledge, you tend to like learning new things and creating new stuff. If you dream that the door knob doesnt work and you are unable to open the door with it, it means that you feel helpless in some situation, because the circumstances are not favorable to you.
Dream dictionary: Knob dream meanings
To dream that you use the doorknob or door handle means that you are entering the new phase of your life. You are ready to go forward and get what you wish for. If you werent able to open the door, because the door knob was broken or it was hard to bend it, then such dream shows that you are afraid to take risks or the circumstances of your life doesnt let you move on, therefore you are unable to control it by using the handle. The dream suggests to pull yourself together and make sure you use your head to solve the problems.