For somebody who develop “Stay Unlock” utility, it’s quite an ironical that I badly need a software that could initiate a pin lock (or device lock) on demand. Pin Lock is a small utility (just one liner code to be honest) that does that, and now I feel much safer …
you can download here
zen online journal 
Thanks for this great application! It helped me a lot!
If You could extend this application with the feature that triggers the PIN-lock when the screen goes off or the device turns on, with event handling due to resource and power saving, it would be the best lock application I ever used.
I hope You will find this feature good enough to make a new version. 🙂
You Are The Man!
@Kika, it’s a good idea, but it’ll be a big engineering effort because of the need to manage the power events. I’ve done it (i.e. the power event) before and it’s quite a big job, so if I were to do it, I will probably keep it as a separate program but thanks for your suggestion!