iphone will not restart nor open apps ands the power button only works for siri

Woke up this morning to my iphone completely ******* up. I can activate siri,but not hard reset my phone. The power button just decided to stop working. I also cannot open any apps and overall, my 12 pro max is not working at all. I cant answer phone calls, only make them and when i try to "share the app" it pops up as an interface error. pls help