Help me out here?

The model goes up in the air but it doesn't go back to its original position when i click the button.

local model = game.Workspace["MODELNAME"]; -- The model you want to move up
local increment = 0.5 --The amount you want it to go up by each time
local max = 10 --The studs you want to go up by
local Button = script.Parent.ClickDetector --Change this to the ClickDetector.
local closed = true;
function onClick()
    if closed then
        move = increment 
    else 
        move = -increment 
    end 
    closed = not closed
    for i=1, max/increment do
        model:TranslateBy(Vector3.new(0,move,0));
    wait(1/60)
    end
end

Button.MouseClick:connect(onClick());