platform not moving when you press the button?

So when you press the 2nd button in my game, its supposed to make this platform move up and down, but instead it stays still even when you press the button.

local part = script.Parent
local button = workspace.Button2.button2.scriptpart2
local e = 1
button.Touched:Connect(function(hit)
    if hit.Parent:FindFirstChild('Humanoid') then

        repeat wait() until button.Touched 
        while true do
            part.CFrame = CFrame.new(36, script.Parent.CFrame.Y + 0.02 * e, -36)
            wait(0.02)
            if script.Parent.CFrame.Y > 20 then
                e = -1
                wait(3)
                if script.Parent.CFrame.Y < 3 then
                    e = 1
                    wait(3)
                end
           end
        end 
    end
end)