How do I make this ClickDetector script work?

I'm trying to make a script that has a model become visible when you click a brick with a ClickDetector, then after 12 seconds it disappears. How do I make it so that I can click the block and it re-appears? I tried changing it a lot, but nothing worked.

visible = true

script.Parent.ClickDetector.MouseClick:connect(function()

    if visible == true then

        for i,v in pairs(script.Parent.Parent["SampleName"]:GetChildren()) do

            v.Transparency = 0 -- 1 is for completely invisible

            v.CanCollide = true

            visible = true

        end

end



wait(12) --this is used to make it disappear again 12 seconds after the lines above were ran

for i, v in pairs(script.Parent.Parent["SampleName"]:GetChildren()) do 
    v.Transparency = 1
    v.CanCollide = false
    visible = false



end

end)

--trying to get it so that after i click the brick, i can come back, click it again, and it works. it doesn't no matter how much i try to change the script to work.