Sacred Haven of Debauchery

Woke up ten minutes before the alarm. I looked and realized that the phone was frozen – the screen turns on, pressing the power/restart/screenshot button brings up the corresponding menu, but it doesn't respond. At the same time, it's impossible to restart or turn off the phone, but... But at 7:00 it clearly turned on the alarm and has been messing with my head for the last half hour. I searched the internet and found only useless advice like "hold the power button/power button + volume button for so many seconds and it will restart!" But it doesn't restart. Too bad you can't easily remove the battery.