This is THE way to get students excited about coding and to start coding in your school. The hour of code is a global movement to get students around the world, at all age levels coding. There are "Hour of Code" events that can be easily organized and resources for every single grade level to do one hour of coding-no matter what their prior knowledge is. Any teacher or administrator can get started here and it is FUN.
Coding with five year old children sounds impossible and somewhat scary, but it can be done! This link provides four-which is more than a teacher would need to use-free and inexpensive coding apps that can be used with early childhood students. The apps in the article are recommended by Common Sense Media-which is the most reputable place to get tech, tv, and movie recommendations for young ones!
In addition to apps and websites, there are a number of toys and more hands on materials children can use to learn computer science. This link provides apps and toys for early learners, elementary school, and middle school students. Some are pricey- like LEGO Mindstorms at $410- but could be an investment made by schools or PTOs.