I'd like an app that allows me to pick a time when I want my phone's password feature to be on and when to be off. When I'm in school, I want my phone to lock in case I get my phone taken away I don't want my teacher using my phone. But when I get home, I don't want the lock feature to be on because I find it annoying to keep having to enter a password in order to use my phone. Is there an app that lets me do this? I prefer a free one but if I have to pay that ok too.