Thanks lol i dont know why the first 4-5 times i tried it it didnt work even after holding it for as long as 10-15 seconds
tried it again and it worked after 4-5 seconds ..
You should not need to hold the keys down for that long. I just rebooted after updating the OS with the three-finger salute, and I only had to hold them down momentarily. It does take about a half to one second for it to start shutting down.