iPhone 14 Plus touch screen locked and not working

If iPhone isn't responding, and you can't turn it off then on, try forcing it to restart. Press and quickly release the volume up button. Press and quickly release the volume down button. Press and hold the side button.

Force restart iPhone - Apple Support

Make sure your screen is clean and free of any debris or water. · Disconnect any Lightning or USB-C accessories.

If the screen isn't working on your iPhone or iPad