How do I make my MacBook go to sleep when the lid is closed if a second monitor is connected?

Question

macOS

At work, I always connect my MacBook to a second monitor (via Thunderbolt, if that matters).
The problem is that I'm already used to moving away from the computer just to close the lid of the MacBook. But when a second monitor is connected, the macbook just starts working only on the connected monitor. That is, the MacBook is not blocked.
How to be?

Answer 1

Terminal

sudo nvram boot-args="niog=1"
sudo nvram boot-args="iog=0x0"

--
To return everything as it was, reset SMC and NVRAM

Answer 2

no sleep

Answer 3

Turn off the power from the laptop, then it will fall asleep. Or send the laptop to sleep in 2 mouse clicks before closing the lid.