You can tick off this task when the display of your device switches off automatically within a maximum of two minutes. The type of lock is irrelevant for the time being. You can use passwords, patterns or even biometric features to accomplish this task. However, do not simply swipe.
People on the run have an increased risk of confiscation. A screen lock is an important first defense against unwanted reading of the devices.
If you are politically active, you should definitely set up a screen lock. You could lose your device if your home is searched or confiscated. The screen lock is a first line of defense against unwanted reading.
A screen lock can prevent other people (in a toxic relationship, for example) from simply installing stalking or spying apps on your device.