How to solve UserInputService?

I was running a simple piece of code and i came upon a error, outputs not giving me anything

local UserInputService = game:GetService("UserInputService")

local aKeyPressed = false

UserInputService.InputBegan:Connect(function(input, gameProccesed)
    if input.KeyCode == Enum.KeyCode.A then
        aKeyPressed = true

        while aKeyPressed == true do
            wait()
            print("A Key is being held")
        end
    end
end)

UserInputService.InputEnded:Connect(function(input, gameProccesed)
    if input.KeyCode == Enum.KeyCode.A then
        aKeyPressed = false
    end
end)