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I have used the pen tool quite a bit over the years and don't think I have ever used Ctrl or Alt.

Here is how I would do it ...

Place 3 horizontal guides equadistant apart. Along the middle one, using the Pen tool, place 4 points somewhat equadistant apart. In your tools menu, click and hold down the Pen tool and then select the "Add Anchor Point Tool".

Half way between the first two points you created, click and release. Now click and hold onto the new point you just created. Drag it either straight up or straight down to the respective guide. Repeat this between each of the original points you made alternating directions with each.

Clear as mud?