Stupid Hypothetical Question De La Soirée

If you came across a door in your house that you’d never seen before, a door that opened onto an absurdly large space that couldn’t possibly exist in your house or apartment as it currently exists — a space that resembled a very large empty warehouse with three or four locked doors (doors to which you have no key) but no windows — would you use the space beyond, since it’d amount to basically virtually unlimited free storage, or would you leave it alone and never go in there for fear that one day the force that joined the door to your dwelling would …unjoin it and take anything inside away to parts mysterious and unknown, or would you seal it shut for fear of what might come through from the other side?