Maybe she would start locking them to protect others.

Now they have stopped joking and started locking doors.

I'm afraid that we may have to start locking her room.

We started locking it then so nobody else would be tempted.

He started locking him in his room at night with a slop bucket and nothing else.

He'd started locking them in at night right after the incident with the barn cat.

The calls prompted the lawyers to start locking their inner office doors out of fear.

If they ever found out, they would start locking the door.

"Looks like I'm going to have to start locking my car and taking my keys inside with me."

She does that sometimes, or at least she did until I started locking her door.