Why a code beats a key for odd hours
When one person leaves for a swing shift as another gets home from nights, keys get passed around, copied at the hardware store and left under the mat for whoever is next. A keypad deadbolt replaces all of that with codes: one per person, each one removable on its own, and nothing hidden outside the door.
Most smart locks also lock themselves a set time after the door shuts. That matters most for the person heading out half asleep at the end of a long shift, who no longer has to remember whether the deadbolt was thrown. Some models keep a log of which code opened the door and when, so you can see the dog walker came by without sending a text to ask.

