The only way to have "security lock timer" enabled is to go to "change screen lock" and change to PIN code access or password. That would allow me just use my PIN to unlock the phone and you can now set the "security lock timer" to whatever time you want. The problem with that is you still have to press the power button to wake up and just slide your finger on the screen to unlock without a password. I just ended up going back to fingerprint/PIN option.