How to change chat visibility?

I am wondering how you can change the chat visibility or can you? I got a basic script in a screenGui. Here it is,

local player = game.Players.LocalPlayer
local mouse = player:GetMouse()

mouse.KeyDown:connect(function(key)
    if key == "q" then
        script.Parent.Parent.Parent.Chat.Visible = false
    else
        script.Parent.Parent.Parent.Chat.Visible = true
    end
end)