How can I unlock the door?

Hint 1 of 9:

You will need some help from Lockjaw here.

Hint 2 of 9:

First, where is the key to the door?

Hint 3 of 9:

Lockjaw's paws can't unlock the door.

Hint 4 of 9:

But they could put the key where Pepper can get it.

Hint 5 of 9:

Push the key underneath the door.

Hint 6 of 9:

The key is definitely underneath the door now.

Hint 7 of 9:

Pepper has solved this problem before though.

Hint 8 of 9:

She helped Old Ben get the key to open his front door.

Hint 9 of 9:

Use the magnet to get the key.