Smart lock alternatives

[Les Jean-Pierre]

Hi, I have a cylinder lock that, when I showed a picture  to a couple locksmiths, is supposedly incompatible with any smartlocks because the door is too thin where the lock is located. I have some lockboxes but any other ideas?

[Tom Degroodt]

Is that a glass inset into the door?  so there is just the little narrow section for the lock?  It sucks to spend the money, but unless the door had historical value, we would replace the whole door.  If it is for an Airbnb where we want a smart lock it makes our life easier.  If it was a long term rental and you only need it for workers during turnover we would use a standard lockbox.