every tick:
    loop all players within 128 meters of location(-16.5, 43.5, 360.5):  #server view distance
        if {route1.%loop-player's uuid%} is not set:  #event to unlock
            set {_i} to -19.5
            loop 7 times:
                make loop-player see block at location({_i}, 43.5, 360.5) as stone
                add 1 to {_i}


on right click:
    if event-block is air:
        set {route1.%player's uuid%} to true #condition fullfilled
        play sound "entity.zombie.break_wooden_door" with volume 2 at event-block for player

on quit:
    if {route1.%player's uuid%}: #to retest
        delete {route1.%player's uuid%}