Hello, in this i will explain to how you open any door in the game! It's really not that hard, it might take some work, but you're gonna have alot of fun along the way!
How-To
Okay, you're gonna need a friend.
Find a closed door, which can be a garage door, or just any RED door!
Next, go to the door and hold on for dear life, and pray baby Jesus. And then you smash that Number "2" button as many times as you can, this will remove the gravity and make you fly up in the air. Keep holding on and you might just open the door.
Note: Pretty sure this only works in a private game!
Doing Other Shenanigans
Now... This isn't the only thing you can do by pressing the button "2". You can also do things like, fly with the Buey on the "Buey" map. Or ruin the stairs on the huge "Towers" map.
Source: https://gameplay.tips/guides/1920-gang-beasts.html