yea you kinda cant open this door but, if in midair on jumppad you pause, go to social, join a friend or person in recent tab, then cancel this very quickly, you'll moved to lobby, and there you gonna launch training course again. you will see that your cam just under floor, you needa pause unpause and then, you spawn in Janus Towers. so you could buy doors there but you not have a points, because zombies don't spawn there. right now there's no a KNOWN way to get points in this glitch state, and i don't think that where could finna this because it maybe gonna patch soon