Instead of having the fingerprint technology used to unlock your phone, have it used to unlock each app. Still let the user swipe to unlock the phone. Once unlocked, you have your row of icons. Each icon, through the settings app, has the ability to read your fingerprint as you touch the icon. So you go into settings, switch the toggle On/Off over to ON for each individual app you want fingerprinting to apply to, then you're set. Now when you open your phone, you could have, say, iMessage and Photos set to only open up when it recognized your fingerprint, but all other apps are available to use by anyone who uses your phone. You could still lend your phone out to someone and if they press on the iMessage app, their fingerprint isn't recognized and it won't open the app. If they press on the Calendar app, it will open because the fingerprint recognition for that particular app is turned OFF in settings. This is how it should be implemented on the phone. Not really the lock screen.