Why is this open/close gui not working? [TWEEN]

So, I am trying to make a gui open/close with tweening, can someone explain why this is not working? It will open, but it will not close afterwards.

script.Parent.MouseButton1Click:Connect(function()
    local work = false
    if work == false then
        work = true
        script.Parent.Parent:TweenPosition(UDim2.new(0.736, 0,0.304, 0))
        wait(1)
    else
        work = false
        script.Parent.Parent:TweenPosition(UDim2.new(0.932, 0, 0.304, 0))
        wait(1)
    end
end)

This is a local script. Any help will be greatly appreciated.