Keypad Lock screen is one of the best parallax effect Lock
For increased security 
You have to just enable pin lock in settings in this application
and create own password for unlock phone screen.

Features
*Slide to unlock.
*Enter pin to unlock.
*A lot of beautiful wallpapers to choose
*Choose Unlock Animation
*Keypad Lock Screen also allows to use wallpaper from Your gallery
*Unlock sound enable/disable.
*Unlock vibration enable/disable.

Keypad Lock Screen is a application which is used for secure your phone