Your master should really have kept the book under lock and key.

Four of them are, at this present time, under lock and key.

She told me that he was kept under lock and key.

It will last up to three weeks, but less if not kept under lock and key.

Course they do want to keep me under lock and key.

Few things in the lab were kept under lock and key.

I'd give anything to have that dog here under lock and key.

"We have to keep the building under lock and key now, even from our students."

The idea is to get it under lock and key, fast.

Only the police are supposed to have things like that, under lock and key.