How do i check if a specific player presses a key?

as the title said, how do i check if a specific player presses a key? Ive tried to do

local cool = {"Cill_Roblox"}
local gui = script.Parent

game.Players.PlayerAdded:Connect(function(player)
	if player.Name == cool then
		if game:GetService("UserInputService"):IsKeyDown(Enum.KeyCode.L) then
			gui.Enabled = true
		end
	end
end)

but that doesnt work since playeradded only checks once as far as i know and

local cool = {"Cill_Roblox"}
local gui = script.Parent
local guy = false
local uis = game:GetService("UserInputService")

game.Players.PlayerAdded:Connect(function(player)
	if player.Name == cool then
		guy = true
	end
end)

uis.InputBegan:Connect(function(input, gameProccesedEvent)
	if input.UserInputType == Enum.KeyCode.L then
		if guy == true then
			gui.Enabled = true	
		end
	end
end)

ive tried looking stuff like "how to check if specific player presses a key roblox" but found nothing on this so far. anyone know something about this? any help is appreciated