I've found the best lockscreen for Android: Temporary Phone Lock. When my boss enters the room, he sometimes grabs my phone just to piss me off and he goes through my pictures etc. Now that I have installed this app he is out of luck To unlock is very fast and not irritating at all. Also the standard lockscreen sometimes onlocks in my phone and starts to dail random numbers, also fixed that problem with this tool. Highly recommended! https://play.google.com/store/apps/details?id=com.SocialMediaKickstart.TemporaryPhoneLockTrial

Nice App. and it really seems very intersting