The very tiny and minimalistic flashlight app will provide you help without "freezing" of your phone or tablet.
It also has a widget which turns on/off your flash when you click on it.
The tiniest flashlight became even MORE TINY, because I removed ads :)
NOTICE #1: To add WIDGET on your main screen you should go to the Widgets' list. Shortcuts which appear on your screen automatically after downloading the app from the Store ARE NOT widgets!
NOTICE #2: I'm sorry, but it doesn't work on Nexus 5 (and I guess neither on all Kitkat 4.4 phones).
Keywords: flashlight, flash, torch, фонарь, фонарик, linterna, lantern, fanar, فانوس, ліхтар, লণ্ঠন, Laṇṭhana, Laterne