Lock Down is a security module for the Xposed framework.
Create multiple PINs to unlock your device. Every PIN can lock apps that you choose. It can also hide the locked applications from the app drawer so the user will be unaware they are currently locked out.
Try the free version of this module to ensure it will work as intended on your device. Be sure to disable or uninstall the free version upon purchase of the full version.
FAQ
How do I launch the app?
To launch Lock Down for the first time call *#*#54321 from your phone app. This is the default launch key. It is recommended you change this key after opening Lock Down.
The app is not launching when I type *#*#54321
This is a common problem when this module is used alongside any quick unlock or similar lock screen modifications. Disable quick unlock and restart device.
Make sure there is a PIN set through the system settings. This is the system PIN and only through this can LockDown be launched.
What is the difference between the full version and the free version?
The free version only supports 1 profile and only 3 restricted applications. The full version supports unlimited profiles and restricted apps. Full version is also updated more frequently with bug fixes and new features.
How are my PINs stored?
All user data is stored in an encrypted file. Any tampering with the file will disable the profile completely.
The free version works but the paid version does not
This is due to Android putting paid apps in /mnt/asec/ instead of /data/app/ where xposed can properly load them. Until there is an official fix for this you can install XMOD for Xposed, which will move apps from /mnt/asec/ to /data/app/. To use it, simply install the XMOD and then install LockDown. XMOD can be removed after LockDown has been installed.
What’s New in LockDown – XPOSED v1.2.2
1.2.2
Fixed issue of paid app not working on some devices while free version works
1.2.1
Improved stability for some ROMs
1.2
Changed default launch PIN from *12345 to *#*#54321 to fix launch issues on some phones. If you are updating from an old version you will have to launch with *#*#54321 and change the launch PIN again.
1.1
Improved file security
More Info in Google Play
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Source: APKDROID.NET