App to lock the phone “right now” I configure my devices to only turn off the screen after a couple of minutes, and only lock themselves several minutes after (so I can quickly turn on the screen without needing to unlock them all the time), for example when outside walking for geocaching.
On Android, I have an application on my home screen which forces locking the phone (i.e. turns off the screen and makes it so that it requires the PIN when turned on again), which makes this scenario useful/secure. I would call this app when I want to turn off the device without needing to turn it on soon.
Which app do I need to install on iOS to achieve the same effect? (iPhone SE, iOS 13)
[Apple] - Use Emergency SOS on your iPhone:

Press and hold the side button and one of the Volume buttons until the Emergency SOS slider appears.


This locks the screen and requires a pin:

If you use the Emergency SOS shortcut, you need to enter your passcode to re-enable Touch ID, even if you don't complete a call to emergency services.

If that doesn't work (iPhone 7 and earlier):

Rapidly press the side (or top) button five times.

Note that you may want to turn off &quot;Auto Call&quot;, to avoid accidentally calling emergency services. This can be done in the &quot;Emergency SOS&quot; settings.