how to make "boxes" appear(updated I made a new idea but idk if it works read it)?

I am making factory conveyor for a challenge that spawns boxes and sends them down the conveyor belt after you click the on button. How should I spawn boxes?

The on button script:

function onClicked(PlayerWhoClicked)
    local c = script.Parent.Parent.Conveyer
    local velocity = 1000
    if script.Parent.Size == Vector3.new(1,.6,1) then
        if c then
            c.Velocity = Vector3.new(velocity,0,0)
            script.Parent.Size = Vector3.new(1,.4,1)
            script.Parent.Position=script.Parent.Position-Vector3.new(0,.2,0)
            script.Parent.Parent.Off.Size = Vector3.new(1,.6,1)
            wait()
        end
    end
end

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

The off button script is pretty much the same.

if I want to spawn bricks should I do something like this: (after line 9)

for I=1, 10000000000000000000000000000000000 do
    if script.Parent.Size == Vector3.new(1,.4,1) then
            b =  script.Parent.Parent.Box:clone()
            b.Position=b.Position-Vector3.new(0,2,0)
    end
end

****Now I have a new idea please somebody reply if it works. Should I try using a repeat until thingy so it repeats the part being cloned every 2 seconds until the off button is pressed and the on button is up?