Auto lock on iPhone 11
iPhone doesn’t switch off when I close the case lid
iPhone 11
User profile for user:
Neil22R
User level:
Community Specialist
Hi bdib,
Do you need help with an iPhone or another device? If you need help powering off an iPhone, see the following guidance:
"Use the side button to turn on iPhone. You can use the side button (along with either volume button on some models) or Settings 
to turn off iPhone.
If your iPhone isn’t working as expected, you can try restarting it by turning it off, then turning it back on. If turning it off and on doesn’t fix the issue, try forcing it to restart.
Turn off iPhone
- iPhone with Face ID: Simultaneously press and hold the side button and either volume button until the sliders appear, then drag the Power Off slider.
- iPhone with the Home button: Press and hold the side button, then drag the slider.
- All models: Go to Settings > General > Shut Down, then drag the slider.
"
Turn iPhone on or off - Apple Support
Since you mentioned closing the lid, here is another set of instructions for help with sleep and wake settings for Mac: Set sleep and wake settings for your Mac - Apple Support
Cheers.