Easton gets his own juice now

Easton can get into the fridge now. It is so funny. He'll tell me I want jucie, please. Then the next thing I know he is in the fridge and he will carry it out the whole carton of juice to me in the living room. I really like he is helping me out but I don't really want him going into the fridge as he pleases. What to do? Do I put a lock on it? He is such a funny kid.