Automator opening Keynote presentations in a sequence

I have created individual keynote presentations as Karaoke type songs that are set to open automatically. I am looking to create a script that would open (Keynote presentation one/song one), have it play to the end, close that file. Then, open (Keynote presentation two/song two), have it play to the end, close that file. Then, open (Keynote presentation three/song three), have it play to the end, close that file. ETC. I usually have about 30-40 Keynote presentations in a folder that I would want to auto play in a numbered sequence. Does anyone know how to create this script automation? Thank you in advance!