How do I create a mechanism of doors?

Hey guys. I wanted to know how do i create a mechanism of doors. I want to do 2 steps.

1- The door remains locked until every enemy in the room is defeated

2- After entering the door the player goes to another layout

I really need to know how to do it before april 24th, if possible

You can use enemy.pickedcount = 0 which means none remain. If you are using many enemy objects then put them in a family and use family.pickedcount.

For the door you can use player on collision/overlapping door > go to layout