Can you solve it? Hint: You gotta be a little imaginative. Also dont google it!

Not enough information. Is there a cement roof? Are there gaps anywhere, seams perhaps. Is the room round or square? How large is the piece of wood? Is there light in this room? where does the light come from? How much air do you have left? Are you completely naked? How thick is the cement? can you break the mirror and use the shards of glass to cut through the cement, however long that takes, or is the wood large enough to pound on it, and maybe form some cracks.