In this tutorial, you will learn how to:
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• Turn on device
• Turn off device
• Unlock device
• Lock and unlock device
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Press and hold the Side button until the Apple logo displays.
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Press and hold the Side button and the Volume up or down button until the slider appears. Drag the slider to turn your iPhone completely off.
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Press the Side button then slide the bottom bar up. To lock iPhone, press the Side button.
Note: iPhone locks automatically if your device is idle for 30 seconds. To adjust the screen lock time, select the  Settings app > scroll to and select Display & Brightness > Auto-Lock > select the desired lock time.