立陶宛采购需求：智能锁，智能锁体，数码锁，指纹锁，机械锁，锁芯

I'm reaching out to inquire about a mortise door lock issue I'm currently facing. The lock functions perfectly from the inside, but it has stopped locking from the outside with the key. This has become a concern for security, and I need to understand what options are available to resolve this issue. Could you provide any insights on what might be causing this malfunction? Additionally, I'm interested in knowing about potential replacement parts or new units that would be compatible with my existing setup. If you have any recommendations or specific products that could help restore the lock's functionality, please let me know. Your expertise would be greatly appreciated!