unable to reboot iphone 11

the procedure for rebooting an iPhone 11 is not to hold just the right button.. Here is a link that tells you how to do it:

https://support.apple.com/guide/iphone/force-restart-iphone-iph8903c3ee6/ios

if this helps, please select 'helpful'.. Thanks!

Do it via Settings app. Go to Settings > General, where at the bottom of the list you find Shut Down.