Control lock over the phone

Smart locks do come with the technology you talk about, and there are more than plenty options out there too, so whatever your budget is, you won't have trouble finding the right one, at least. I'd recommend to get a smart lock that doesn't only open via Bluetooth over your phone, but with a physical code too, cause you never know what might go wrong with your smart device and it's best to have a classic 4, 6, or 8-digit code to fall back on when this happens.

There's also the physical key bypass that still remains important, especially if you want to give access to, say your grandparents, people who are unlikely to handle opening the door either through a PIN or with a smartphone. No matter how you look at it, smart locks are the securer option for entry door safety, hands down, but you still have to take into consideration multiple opening options, it's for the best, you never know what situation you'll get confronted with down the road. I'll give you some useful reads too for extra info.
https://www.optimainstitute.com/locks/smart.html
http://www.tuxonice.net/keyless-entry-front-door-a-measure-for-safety-enhancement-or-theft-predisposition.html
https://www.top-gadgets.net/latest-smartphone-controlled-gadgets-all-tech-geeks-must-install/

Why don't you use a smart key?