How do i move the player to another level?

So basically I’m done with the start of the game and at the end of the level, there is a door (A normal one you can’t open it and it don’t have an animation on) and I am wondering how do I make it so when the player goes to it and pressed “E” it loads him into another level that I’ve made. And how do i make it sound like I’m opening a door and how do i import like a loading screen? if you can answer please do or reply with a video, Thanks!