
Ah, Physical Security
As for the government/police using a backdoor (default codes, reset codes, etc.) on a citizen-of-its-country's device: if they've gotten a proper warrant for it, then sure, that's okay.
As for the existance of backdoors in locks, electronic or otherwise: boo, hiss, that's bad, because the "secret" info, like hydrogen, inevitably escapes. At that point, the end-user is fucked.
If you want true security, you have to design and build it yourself, or perhaps have a trusted friend with the skills do so for you. Traditional lock/safe-making corporations such as Chubb, Schlage, Mosler, Diebold*, etc., are not within my "circle of trust." YMMV.
*Yes, the same Diebold who also is the maker of proven-flawed voting machines. "It's not who votes that counts. It's who counts the votes." -- attributed to Stalin.