In this episode, Chris Wright shows us how to quickly restart an iOS device with the Assistive Touch Accessibility feature.
Assistive Touch is a feature of iOS and iPadOS that allows you to perform a variety of common tasks from one centralized menu, or map tasks to specific gestures. Intended primarily for people who are not able to easily interact with hardware buttons, it can also be helpful if you can't see the screen and need to quickly restart your device, which might otherwise require you to guess the precise button release time.
It can be turned on by going to Settings > Accessibility > Touch > Assistive Touch, and toggling it on. By default, it appears as a menu that's constantly visible onscreen; double-tap this menu and select the task you want to perform. You can also configure a custom action as demonstrated in the episode, where a "single tap" (double-tap for VoiceOver users) of the Assistive Touch menu would initiate a device restart instead of revealing the menu.