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You have 2 options
1. press and hold power & volume down (2 seconds)
or
2. press the task manager virtual key (square key) > tap on the pink icon
You have 2 options
1. press and hold power & volume down (2 seconds)
or
2. press the task manager virtual key (square key) > tap on the pink icon
This post will help you you a lot
http://talk.sonymobile.com/t5/Software-Updates/Lollipop-New-Features/m-p/955490#U955490