How do I get the key from the rummy?

Hint 1 of 6:

If you have the money, just buy it.

Hint 2 of 6:

If not -- that rummy has had a *lot* to drink recently.

Hint 3 of 6:

He's probably starting to hallucinate.

Hint 4 of 6:

Maybe he's even hallucinating about alcohol.