I like smart locks. Now there are much more modern locks with some key features that makes this types of locks best you can ever have. Mine has Card Lock, Finger Print lock and a Pin Code lock. The great thing it can be synchronized with my phone and it tells me who have opened the door(As the Card ID's can be customized and you can create profiles for any card holder). But, you have to install it correctly and for this purpose I would recommend you to call a professional, a reliable lock change london or any other region you live. A good Lock change master will install this type of lock correctly and will perform a diagnosis and a quick setup for you.