I can't turn off iPhone because of the magnification

And if the triple tap doesn't work, Force Restart your iPhone.

• Press and quickly release volume up button
• Then press and quickly release volume down button
• Then press and keep holding the side power button (keep holding past any messages) until the screen goes black AND when the Apple logo appears, let go

Correction: Double-tap the screen with 3 fingers.

Triple-tap the screen with 3 fingers.