How do I escape the cell? (Thief)

Hint 1 of 5:

A thief without his tools is pretty useless  isn't he?

Hint 2 of 5:

Did you read your Famous Adventurer's Correspondence School guide book?

Hint 3 of 5:

Go read the Thief section again and pay special attention to the improvisation
paragraph.  Don't worry, I'll wait for you.

Hint 4 of 5:

Do you have something that could pick locks?

Hint 5 of 5:

You have one item. Go ahead and use it to pick the lock.