Good idea - especially if you had too many sherries - like he has 
. R-
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I have an August smartlock and am in the UK… and I do Airbnb for a room at home.
All works well. Never had an issue. Saves giving a physical key out to guests.
Also have a dog. When I’ve been stuck on the m1 or on a train, I’ve used it to remotely let a friend/neighbour into the house to look after the dog.
And have also used it to remotely let a plumber in when I’ve been at work.
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What happened?
They primarily use bluetooth. WiFi is usually only used with a ‘bridge’ to allow remote lock/unlock.
They differ, some have NFC tags as an option or as a backup to tap-to-open, some allow virtual ‘keys’ to be sent to other phones for one-time use. Most are battery powered with enough notice of ‘low battery’ and some allow operation of the dreaded ‘dead-battery’ syndrome by touching another battery to the lock. This doesn’t open it, just powers it temporarily to allow it to work to let you in after coming back off a 4-year holiday. There’s not that many options for the typical UK doorlocks. The US deadbolt system (separate lock) has better options.
The majority of smart locks have some kind of bypass.
Power - you can usually charge it from outside, enough to get you one time access so you can get in and charge correctly / replace battery.
Internet failure - generally you can then use Bluetooth, NFC, pin code if ones available or an actual key.
Or for a £5 option just hide a key outside
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The Yale Linus ([This one](Yale 05/101200/SI - Linus Smart Lock - Silver - Keyless and secure door lock https://www.amazon.co.uk/dp/B08FMY6JTN/ref=cm_sw_r_cp_api_fabc_6F9C38QV3CEDH025V4MX?_encoding=UTF8&psc=1) keeps the same lock on the outside or you can replace it with a Yale lock if yours doesn’t fit properly.
So you can still use a physical key on the outside as a fail safe. Also the inside is can be twisted manually as well.
So it keeps the tradition lock style by with a smart function for the smart home stuff
I have a Yale Conexis L1.
To open the lock I have both Bluetooth direct from the phone, WiFi through a bridge from my phone as well as a physical fob.
The fob allows access for connectivity issues and its external prongs allow external charging with a 9v battery if the batteries fail.
In the end I also have a rear door which is still key operated as an ultimate failsafe.
I have a brick or a locksmith dependant on which ones cheaper at the time 
It’s £352 to get into my house with a locksmith if I can’t get through 2 doors 
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I’ve stayed in an Airbnb which used a Yale lock and that was dope.
I downloaded the Yale app, they emailed me the “key” it worked flawlessly and then on checkout just stops working.
Easier for the host and easier for me. Win win.
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I have a smart lock.
If the battery dies (never happened yet, but it would warn you before hand anyway), it has a micro USB port so you can plug a power bank in. Failing that, it also has an emergency key slot.
If the battery dies when you’re away, it simply won’t unlock. The power somehow connects the handle to the lock mechanism, no power means it’s not connected, and it’s magnetically shielded anyway. I think it somehow locks the mechanism in place when not engaged.
Why can’t houses be locked like cars 
Press a button on a fob, all windows close, doors lock and the alarm is primed. Press again to unlock 
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I’d invest in that
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The number of times I’ve walked up to my front door pressing the button on my car key 
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There’s an interesting video I saw some months ago about the security of car fobs - there’s definitely more in built security than I had expected, and while you can hack your way in, it’s probably trivially easier to break into a house, or pick a lock, than some of the exploits you’d need for a car fob:
Interesting none the less
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I’m going to invent it and become a millionaire regardless. I’m sure I can make it nice and secure 
It’s going to flash the house lights and make a loud chirp sound too - it will be glorious.
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Can you make it so if you hold the second button down for five seconds the door pops open?!
Garage door?