My bedroom door

There is a door for my bedroom and I haven't used it yet. My door is always open and never shut because of my cats. They like to sleep my bed and I cannot deny them. However, Cloud (the Grey Cat) learnt to shut the door on Kimi. When she doesn't want to be bother. She simply close the door on Kimi. But Cloud still hasn't mastered the art of opening the door yet. She will lock herself in the bedroom and have no access to food and water.