Help with turning a player into a kid if group rank is below 3?

I am trying to make a charecter smaller if a player is in a group id below 3. This is what I have got so far and i have no idea why its not working.

group = (5155684)
game.Players.PlayerAdded:Connect(function(Player)
    if Player:GetRankInGroup(group) < 255 then 
        print("Im going to make the child a kid now")
 		local scale_to_be = 3; 

        local hum = Player:WaitForChild("Humanoid"); -- The Humanoid of the Character.

        local scales = { -- Table with all of the Scales under the Humanoid.
            hum:WaitForChild("BodyHeightScale"), 
            hum:WaitForChild("BodyDepthScale"), 
            hum:WaitForChild("BodyWidthScale"), 
            hum:WaitForChild("HeadScale")
            }

        for _, scale in next, scales do 
            scale.Value = scale_to_be;
        end -- end for the for each iteration.
print("Player should be kid...")
    else
        print("Player is staff.")
    end
end)

The 255 in the getrankingroup thing is in order to test.