The room is your own personal being or individual consciousness.
A closed room would be some part of the physical nature that was not open to the light.
This negation is the very nature of the physical resistance and the physical resistance is the whole base of the denial of the Divine in the world. All in the physical is persistent, obstinate, with a massive force of negation and inertia — if it were not so, sadhana would be extremely cursory. You have to face this character of the physical resistance and conquer it however often it may rise. It is the price of the transformation of the earth-consciosness.
It is not easy to get into the Silence. That is only possible by throwing out all mental-vital activities. It is easier to let the Silence descend into you, i.e., to open yourself and let it descend. The way to do this and the way to call down the higher powers is the same. It is to remain quiet at the time of meditation, not fighting with the mind or making mental efforts to pull down the Power or the Silence but keeping only a silent will and aspiration for them. If the mind is active one has to learn to look at it, drawn back and not giving any sanction from within, until its habitual or mechanical activities begin to fall quiet for want of support from within. If it is too persistent, a steady rejection without strain or struggle is the one thing to be done.