Looking for an app that will lock screen after countdown

[Android Question]

I am looking for an app that will lock my screen after a countdown timer expires. For example, set timer for 30 minutes. After 30 minutes elapses, the screen locks.

I want to install this on a Nexus 7.

 

[Guggy]

Its called Auto Screen Shutoff, find it in the Settings for display....

 

[girolez]

Hi

Yes it should be in the system settings

menu
settings
lock screen
lock automatically - then set the time delay you want.

Roger

 

[JD123]

I don't have an Auto Screen Shutoff on my Nexus 7 settings. Under Settings > Display my categories are Brightness, Wallpaper, Sleep, Daydream, Font Size, and Cast Screen. Sleep only times inactivity...

I also looked under Settings > Security. I have an Automatically Lock, but the only options are "X Seconds after Sleep", so that won't do what I want.

I am looking for a way to lock the screen automatically after X minutes of activity or inactivity, regardless.

Any other suggestions?