I have the Garadget skill (by Softcomplex, Inc) enabled. You have to really enunciate the "d" sound in "Garadget" that Alexa is expecting based on the name spelling so (Ga-raD-jet) or (Ga-ratchet). For me "Ask Garadget to open home" works okay, but "Ask Garadget to open the door" works just as well or better. Also I have only one door and it is also named "Home".
If anyone or anything (television, radio, kids) are talking at the same time I have to repeat the command for Alexa.