nothing happened.
I´m new to this and the thing i wanted to create is a door and you have two levels. (first level is outside a house where you can walk around the world, and in the second level you are inside the house)
When you are in the first level and press E at the door to enter the house, you will be loaded in the second level where you can either do some stuff inside the house or press E again at the door and it will load you in your normal world outside the house.