In Revelation, Jesus says He stands at what, knocking?

'Behold, I stand at the door and knock. If anyone hears My voice and opens the door, I will come in.' The image is intimate rather than forceful — an invitation that waits to be answered.

Revelation 3:20 · BSB

“Behold, I stand at the door and knock. If anyone hears My voice and opens the door, I will come in and dine with him, and he with Me.”