You are facing towards the open door. Turn around and move to your front side towards the sofa, pass through the sofa, you will find an open entrance. Enter through it and take right from the black table with a flower vase. You will find a staircase in the right side. Take the stairs and go towards upside. Stand in the middle of the stairs and that will be your end point facing upwards where you can see a closed door in the upward direction.