The oven

My child is obsessed with the oven. It broke probably 2 weeks after we moved in, then we couldn't use it for a week, so I just didn't care if he played in it. Now that we have an actually working oven, he won't leave it alone. I finally bought an oven lock because I kept finding things in it. Well last night, while I was cooking pizza, I started smelling something burning, like plastic. Turns out he put 3 cars in the bottom broiler. It of course has a separate door that I can't lock. Good-bye cars.