Thanks for asking your question in the Apple Support Community. I understand that you're unable to restart your iPhone and you're seeing the Emergency SOS option on the screen.
When trying to restart your iPhone, if you press the side button too many times in a row, it activates Emergency SOS mode. It sounds like this may be happening here. You can find out more on Emergency SOS mode, including how to turn off the auto call feature here: Use Emergency SOS on your iPhone.