But when they got to within a few feet of the door it silently opened.

Like the door of the secret room, this one opened silently.

Each stepped forward in turn and silently opened his hand.

He pulled at the handle and the door opened silently.

At the end of the room was a door, which opened silently and automatically.

When she had gone it opened silently of its own accord.

The Shadow silently opened the glass door and closed it behind him.

She strode forward, head held high, and the single heavy door opened silently before her.

Then she went to her closet, silently opened its door and stepped inside.

I turned round to see the big Chinese man silently opening the doors for me.