Gui Open and Close with :GetMouse() ?

script is in StarterGui, doesn't work. No idea why.

Local = game.Players.LocalPlayer
Mouse = Local:GetMouse()
inventory = Local.PlayerGui.Inventory:findFirstChild("InventoryGui")
open = false

function open()
    inventory.Visible = true
end

function close()
    inventory.Visible = false
end

Mouse.KeyDown:connect(function(Key) -- q pressed
    if Key == "q" then
        if open == false then
            x = true
            open()
        else
            x = false
            close()
        end 
    end
end)