Don't open the door

If this is an experiment, somebody must be observing it. Therefore, your best bet is to make it as boring as possible for the observer in hopes that they give up and let you out, or at least decide not to bother repeating it.

Ramble on for several hours about beets.

No you fool they will simply dispose of us if we are not entertaining. Dance. Dance like you have never danced before. Burn the room down in a disco inferno.

To the sound and beat of the best music you could think to sing.