Force computer to sleep

Question

I plays songs and I want to force the computer to sleep after 15 minutes. If I'm playing a song the default sleep when Idle after x minutes does not work. Is it possible to force the computer to sleep, even if not idle?

PS: I Already tried this.

Answer 1

Open cmd, and type shutdown -s -f -t 900
-s means shutdown, -f means force shutdown, -t means timer, and 900 means 900 seconds

To cancel the shutdown, type shutdown -a (-a means abort shutdown)