Or are you always worried due to the looming danger of unannounced intruders?

Dont worry, the solution is simple.

Use the incognito (private) window.

This Door Lock Automatically Locks Itself When You Are Browsing In Incognito Mode

The gadget works via an Arduino-powered door bolt that locks itself whenever you start browsing privately in Google Chrome.

Mike says its intended to protect husbands shopping for their wives Christmas presents.

Lets face it guys!

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[…] But what if she bursts into the room while you were … shopping?

Below is Mikes demonstration of Incognito Lock.

source: www.techworm.net