How does the man escape

A man is trapped in a room.
In the room their is a table, chair, 2 doors, and a small hole in the ceiling 12 inches in diameter.
Behind one of the doors is an extremely hungry lion that hasn't eaten in a couple of days.
Behind the other door is a glass tunnel that magnifies the sun creating temperatures so high that even opening the door could kill you.

How does the man escape?

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He waits for the night and then escapes through the door having the glass funnel.