How was the photo of holding the sun taken?

This kind of photo is usually taken at sunrise or sunset. The lens usually uses a standard lens of 50 mm or a small wide-angle lens of 35mm, and then the person stands in front of the camera, whole body or bust. The photographer instructs the person to put his finger in the right position, just like holding the sun, and press the shutter.

When taking this photo, the sun must be completely above the horizon.