How do I open the bathroom door? Cat is trapped inside and sims refuse to go in for any reason

Try deleting the room. Furniture will be placed in the inventory. Cat should just be sitting on the grass wondering what the heck just happened, slowly realising that it's life is just a video game. And it's movements are just a small piece of code, just to add to this big enigma....
Sorry. Had to.
Ok, but you will, loose your wallpaper and flooring so it will cost more to get it back. With furniture, say an item is 80 Simoleons, you can sell it for 8. Ouch, yeh.
Before doing this DRASTIC RENOVATION, make sure that nothing is in front of the door. I once made the mistake of putting the toilet next to the door, and then the door would stay open while they tried to go to the toilet without virtual life'S strange ocurrences.

That's all the advice I can give.

WAIT

I just remembered , and can't be bothered deleting my previous statement, coax the cat out by tapping on it's say, bowl, then " call over" I know that this works with dogs and puppies, but I dunno bout cats and kittens. Anyway, it should come out and at least look at the bowl. Let's just hope it's bowl ain't in the bathroom. Another thing, maybe try the double or single door frame instead. Privacy? No. Cat out? Let's hope so.