I use Apple Pages quite often for making PDFs that I need for printing. I make PDFs often enough that for me, it warrants a keyboard shortcut.

To make a keyboard shortcut, you need to open Preferences and to which menu item you want to add the shortcut.

To add CMD-` (the key to the left of the 1 key) to Apple Pages to quickly access from the menubar, File, then Export to, then  PDF…, you need to know the exact spelling of the menu item.