Strange muffled sounds reaching your ears – where could they come from?
Is what is supposed to be a door leading anywhere? In any case you’ll have to enter the unknown after you managed to open it. Maybe it just falls off its frame instead of opening, and you will be facing the void…
Meanwhile the clock on the wall might turn out a Salvador Dali “flexible” or “soft” one, rather irritating than showing the time. Melting away. Take a step out of time, out of your believed-to-be-safe life. Enter the next floor.