10 minutes to escape or this room

Cold sweat slicks your palms as you take in the dimly lit room. Cobwebs drape the corners, and dust motes dance in a sliver of sunlight slicing through a boarded window. A single, flickering candle casts grotesque shadows on the uneven stone walls. On the far side, a heavy iron door stands menacingly shut. A digital clock on the wall blares crimson: 9:50. A raspy voice echoes from a hidden speaker, "10 minutes to escape, or this room." Your heart hammers a frantic rhythm. Can you find the hidden clue, solve the puzzle, and escape before time runs