You can easily lock apps on your iPhone by using Screen Time. Go to Settings → Screen Time → App Limits → Add Limit, choose the app, set a time limit (like 1 minute), and enable the passcode. Once time runs out, the app locks until you enter the Screen Time passcode.
To lock apps on an iPhone, use Screen Time in Settings. Enable App Limits or Downtime, set passcodes, or use Guided Access for temporarily locking specific apps.
Locking apps on an iPhone is a piece of cake if you simply long-press on the app icon and choose "Require Face ID" (or "Touch ID" or "Passcode") from the quick actions menu. However, there are some preinstalled apps such as Calculator, Camera, and Settings that cannot be locked this way.
To lock apps on an iPhone easily, go to Settings > Screen Time > App Limits, set a limit for the desired apps, and use your passcode. You can also use Guided Access to lock a single app temporarily.
