Have a look at the attached Youtube Video, which has been viewed over 1 million times. Do you think that maybe some of these viewers might be those who want learn an easy and fast way to break into your home ??????
Now here's another Youtube video to show how to prevent this from happening to you. I like the option of using the twist tie given that in an emergency, such as a fire, you can still get out. Also you may want to shorten the pull cord so that it can't be grabbed in the same way and then pulled; using a slip knot to shorten the cord is a great option.
Stay Safe
Darren
The Urban Sheepdog

