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ALGORITHMS how to open a door First of all, you need to know that there are different types of doors and knobs, there are the ones with a round shaped knob or the ones with an horizonltal and flat shape. START: Stan one step away from the door. Lay your hand on the knob. Press down if its a flat knob or twist it to the right if it has a circular shape. Then just push the knob towards you and the door will open. STOP.