She turned the knob, but the door didn't open.
He turned the knob and pushed on the door.
She turned the porcelain knob and pushed the door open.
When she'd finished, she twisted the knob and pulled.
A moment's hesitation, a quick hand on the door knob, and Edith Shipton disappeared into the bedroom of her long ago lover.
After turning the knob once to confirm it was locked, he paused, somewhat unsteadily, and glanced across the motel parking lot.
At the door he paused with his hand on the knob, his tone once again authoritative.
Gradually the water became clear and she twisted the knob until the water flow stopped.