Create outlines from multiple selected text boxes at once?

Hello,

I have a menu document that I imported as a PDF. I would like to select all the text boxes and convert them to outlines, but if I select more than one text box, the covert to outlines box in the toolbar grays out. This option also disappears from the right click menu.

Does anyone know a solution for this? Selecting them one by one is very time consuming.

Thanks!