Block that lets only players with a gamepass through?

It's because of the recent GP change that requires MarketplaceService now. Try putting this script in a part/door. Take out the bottom portion if you don't want the door to kill non-gamepass holding players. You can add your teleport part of the script there if you like.

local door = script.Parent
 
function open()
    door.CanCollide = false
end
 
function close()
    door.CanCollide = true
end
 
function get_player(part)
    for _, player in ipairs(game.Players:GetPlayers()) do
        if part:IsDescendantOf(player.Character) then
            return player
        end
    end
end
 
door.Touched:Connect(function(part)
    local player = get_player(part)
    local character = player.Character
    if not player then return end
 
    local allow = (
        game:GetService('MarketplaceService'):UserOwnsGamePassAsync(player.userId, 1234567) -- Paste your game pass id here
    )
 
    if allow then
        open()
        delay(4, close)
    else
        character.Humanoid.Health = 0
    end
end)