I have 2 key fobs, one intermittently stops working, so today I tried to open the door with the mechanical blade and discovered that it doesn't work.
The same blade does work in the trunk.

Do we have a Wiki how to address this problem?
Tried to search but didn't find anything.
Thanks in advance!

First try some WD40 in the lock, outside cylinders can get some remarkable crud buildup when they don't get used for years. If that frees it up, chase the WD40 with some Brakleen and then follow it with graphite lock lube.

Nissan can't sell you a coded lock, but on most older models a smithy can recode the tumblers to avoid having two keys. You might want to discuss that with a knowledgeable smith if you can't save the existing cylinder.

WD40 worked! Thank you!

Aint no lock WD can't open ............................ ......

Rename title ?........... "Cannot open front door with the key blade........criminal CAN open front door with switchblade "