It's Monday morning here in Tokyo and we have cloudy skies.
Our idiom for today is buzz in.
We can use this when someone electronically and remotely unlocks a door for another person.
Example 1
A. Hello.
B. Hi, I have a delivery for Tom, can you buzz me in?
A. Sure, we have been expecting you.
Example 2
When you get to our office, call me and I'll buzz you in. The security is very strict.