My front door key is on the same ring as my car key, so it will already be in my hand.
The lock is a common pattern that is reasonably secure, as well as benefiting from a degree of 'security by obscurity'. The chance of anyone bar a locksmith having a key that will fit is pretty remote. Besides, I have pretty good neighbours who would take interest in someone standing there trying a bunch of keys!
Nobody can take their time secretly hacking it while sitting in a car in the street, and no organisation can suddenly withdraw access without warning.
It is unaffected by power failures of any sort.
As for break-ins, once in that scenario all bets are off.