How would you make this script move slower?

This is a model script and i want the model to move slowly upwards and i also want it to play a sound (only once) when the button is pressed.

Any help?

local model = game.Workspace["Door4"]; -- 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
local isMoving = false

function onClick()
    if isMoving == false then
        isMoving  = true
            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
        isMoving = false
    end
end

Button.MouseClick:connect(onClick) ;