How can I lock it from inside without the phone ? I set it to auto-lock after 6s. It says "Locked" but in fact it never locks.

You can’t. If it isn’t actually locking when it says it is, then there is a malfunction with the lock. It is an odd thing tho, the handle still moves when the door is locked. So, make sure that you are testing that it is locked from the outside, with the door shut or it will always seems as tho it is unlocked.

Every other day when I go to unlock the door it says operation failed but gives no explanation, my key code or key fob will not work also

I would return it. Mine works completely fine.

can the keys be re-keyed to match my other keys?

You most likely can however, you have multiple ways to set this up, finger print, passcode, key fob and key.

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Description

🔐 Upgrade your front door to smart security—because your home deserves the future today!

SMART HOME READY - Integrates with Alexa & Google Assistant for hands-free control and modern living.
SEAMLESS MULTI ACCESS - Unlock via fingerprint, passcode, app, key fob, or voice—never worry about lost keys again.
ENTERPRISE GRADE SECURITY - AES256 encryption ensures your data and home stay protected at all times.
DIY INSTALLATION IN 10 MINUTES - No drilling or locksmith needed; fits standard door sizes for effortless upgrade.
ULTIMATE CONTROL CONVENIENCE - Manage users, share e-keys, and track access history via the intuitive NICE DIGI app.

The KUCACCI Keypad Smart Door Lock combines biometric fingerprint access, multi-method unlocking options, and AES256 encryption for top-tier security. Designed for easy DIY installation, it fits standard residential doors and integrates seamlessly with smart home ecosystems like Alexa and Google Assistant. Perfect for busy professionals and families, it offers app-based user management, e-key sharing, and real-time access tracking, ensuring convenience without compromising safety.

Specifications

Brand	KUCACCI
Special Feature	Auto-Lock, Back-Lit Keypad, Fingerprint, Fob Unlock, One-Touch Lock
Lock Type	Biometric, Keypad
Item dimensions L x W x H	8.8 x 7.7 x 3.7 inches
Material	Metal, Stainless Steel
Recommended Uses For Product	residential security and smart home integration
Style	Smart Lock
Color	Black
Number of Pieces	9
Finish Type	Painted
Included Components	NICE DIGI app, key fob, screws, mounting hardware
Controller Type	Amazon Alexa, Google Assistant
Shape	D Shape
Control Method	Voice
Connectivity Protocol	Bluetooth, Wi-Fi
UPC	709226220048
Manufacturer	KUCACCI
Item Weight	2.68 pounds
Product Dimensions	8.8 x 7.7 x 3.7 inches
Item model number	KUCACCI-[ALPHANUMERIC CHARACTERS]
Finish	Painted
Special Features	Auto-Lock, Back-Lit Keypad, Fingerprint, Fob Unlock, One-Touch Lock
Batteries Included?	No
Batteries Required?	Yes