Can't exit iPad Guided Access
This is extremely weird. I lent my iPad with guided access to my friend and he came back with the iPad displaying the Home Screen. App icons are darkened and I can't access anything. I tried triple-clicking the top button but simply doesn't work. I then accidentally took a screenshot and got into the screenshot editing page and I can no longer tap on anything. The screen is completely frozen. I can't touch, exit, lock, or even power off it. Every procedure I found online like holding the top button for 15 seconds doesn't help. Any help would be appreciated!
iPad Pro, iPadOS 16