If you can turn on the screen again by pressing the power button and you don’t have to put in your screen lock pin | swipe code | password, then it’s a different thing.
Hm, maybe it is an option I got with GravityBox, then. I remember a menu where I could differentiate between the screen turning off and locking the phone. I used it because I often pick up my phone after several minutes again, and don’t want to have to type in the whole password then - but I still want it locked when I leave it on the table or a coat for a while longer.
(Sorry, I can’t check where to find that menu, because my phone is partly defunct since a week. and I’m waiting for a RMA number to return it. )