Mapping the passcode lock screen to a button

[dakidobf]

I tried to search but came up with nothing. Is there a way to map the passcode lock screen to a button. Not the regular device lock, but make it so i can press a button and it locks the device to where you have to put the passcode in.

I'd like to have the option to lock it quickly whenever I want instead of waiting for the phone to timeout, or going all the way into settings