Mouse lock for inventory system?

Im attempting to make a inventory system, when you click TAB the gui will be brought up and then i want your mouse to be able to move freely so you can mess with the inventory and things, and when you click TAB again the gui will be no longer visible then the mouse lock will be back.

Heres the script i have so far i just need the mouse part figured out.

local hotkey = Enum.KeyCode.Tab

local UIS = game:GetService("UserInputService") local open = false

UIS.InputBegan:Connect(function(key, gp) if key.KeyCode == hotkey then if UIS:GetFocusedTextBox() == nil then if script.Parent.Visible == true then script.Parent.Visible = false

            --Mouse unlock

        else
            script.Parent.Visible = true

            --Mouse lock

        end
    end
    end

end)