iPhone 11 has suddenly zoomed in - unable to unclock the phone using face ID and/or put a code.

Force Restart;

1. Quickly press and release the Volume Up button.
2. Quickly press and release the Volume Down button.
3. Press and hold the Side button until the Apple logo appears, then release the Side button.

1. Restart the device. That's it.

Turn off. Simultaneously press and hold the side button and either volume button until the sliders appear, then drag the top slider to power off. Or go to Settings > General > Shut Down. See Turn iPhone off and on.

Force restart. Press and release the volume up button, press and release the volume down button, then press and hold the side button until the Apple logo appears. See Force restart iPhone.