A few years ago I volunteered for Hour of Code. I visited my older son's classroom, and it was rewarding to see all 25 first graders in the room deeply engaged in a coding activity. We talked about Computer Science, my job as a Software Engineer and the company I worked for. We also watched some videos, and worked on "The Foos", a really fun game/coding activity designed by Code Spark Academy for the Hour of Code. Similarly, I worked with a group of fifth graders, going through the Minecraft Hour of Code activity instead, and they loved it.
Check below for a link to the video playlist I created for the little ones.