How can I get an iPhone 6Plus to go to sleep after 2 minutes of non-use?

How can I get an iPhone 6Plus to go to sleep after 2 minutes of non-use?

Go onto your iphone settings, then press display and brightness, next you press auto-lock where you can choose how long your phones in non-use before turning off.

Settings>Display & Brightness>Auto-lock>(select value ranging from 30s to 5m)

It's in your Settings

Settings > Display & Brightness > Auto-Lock > 2 Minutes