Hello Everybody!!

[Armando Herjim]

I live in Mexico. What´s the diference?

[Luciano]

Hi,

You need an electric lock mechanism that will replace the existing one
with minimal modifications to the door and where a standard key can
still be used. (The key is used by the office cleaner, as backup during
power interruptions, in case of fire, ....).

What is the brand and model of the existing lock mechanism?

If your friend is renting the office, you should ask first for permission
the owner of the building before you modify the door.

Best regards,

Luciano