This is actually the same question as one I answered a couple of days ago, so I will give you exactly the same answer:

The keyhole is the talking doorknob in the bizzare room, and you should be able to automatically open it after defeating the world boss. Find the pieces of evidence needed for the Queen, and from there on, it should be easy.

Just in case, here is a more comprehensive answer:

A door from the teaparty room leads into the bizarre room. The cat is there and he says to turn on light. The room is upside down, so go to 'touch' fire at two 'lights' poking up from the floor.

Release the latch near the floor - head into the queen's garden. Now go in the bizarre room (right-way-up) and go up on the table. Talk to the cat again. He says that shadows will be here soon. Sure enough, here comes a big red-black shadow. You get Ifrit's Horn when he dies.

The fight wakes up the doorknob. He yawns, and your key blade opens up the doorknob. You get a Navi-G Piece.
Good luck!

u cant wake it up cause its a lazy doorknob and its whole goal in life is to make u mad cause u cant wake it up

I did all that but I still can't get red trinity and when I go to the world map it says wonderland is still locked.

This is true. Just push the bed 'fore ya get small so you can get to the castle