So the cost of implementation could be as low as $200 for a Schlage Sense (Apple Home Kit compatible) or Connect (Wink or any Z-Wave hub) door lock plus an additional $150 for either of the operating hubs that work with the door locks to allow the door to be locked or unlocked from anywhere in one has an internet connection.

While the income is passive from a tax standpoint, it is not like owning for example stock in AT&T where you sit back and collect your ~ 4%dividend - that is truly passive.There is definitely work involved, sometimes very little and sometimes it can be a part time job, but unlock a security such as a stock or a MLP or a REIT that you have no control over that pays you dividends and distributions, you're in direct control of your asset and directly can influence it's value as well.There is a trade off here.

The kind of place you can leave your shop unlocked and not have your tools stolen.

Today that approach is gone for many asset classes as they are approaching peak values.So to still give yourself a safer margin you have to build in value either through building new construction at a higher cap than you can purchase for existing, value add for lease up with a problem property but good location, or and property that is fully stabilized already but you can unlock value through reducing taxes, increasing rents, reducing expenses through operational streamlining. 

There are stories (unsure if their factual nature) of people being locked in the house during a fire since they couldn't find their keys to unlock the door.

I'm trying to find a podcast/post/webinar that Brandon Turner did that had a title similar to 12 steps to unlock a bank loan.  

I have very little mortgage left on my condo, and would like to unlock this value.Does anyone know any banks that would provide HELOC's on a mixed-use condo?

He simply leaves his door unlocked and leaves a couple minutes before we arrive.

I feel like there must be a company that makes an app or technology for smart phones where someone (like UPS or FedEx) can call you and you can unlock an entry door from a distance.Much thanks!

They were getting in from the back unlocked window.If you do invest there, I'd recommend doing only the necessary to maximize your Section 8 rents.