using automator to play specified playlist at periodic time

Hi, I created a workflow via automator to have itunes play a specified playlist. However this workflow only plays the playlist if all the songs in the playlist are selected. I couldn't find any action to select all songs within a playlist

Çan somebody advise how I can use automator to find a specific playlist, select all songs within it and then play the playlist and at the end unselect all the songs

Thanks, Yusuf