... probably not the regular tasks, but
For all the "regular" tasks, GTD might not be needed.
(So no project plans like "make grande latte" for you.)
But I know from own experience that even the dullest labor has its non-regular projects.
These often include agendas:
-Talk about the trash situation.... scheduling?
- Need new cups, a lot are chipped-customers are complaining.
Or maybe you can take some notes about preparations or important tasks.
- extra, extra cleaning of the kitchen on Sat... also see Agenda Leon
and like eeckberg said, events or other importants, like the bank training all of its managers.
(This might go into seceral categories spanning several actions)
- order extra coffee week 34
- talk about specials for the bank
- talk about specials
As you see, this will work to get you into a productive work-environment.
You might want to keep those notes on a small notepad (in Germany, this type is called a waiter-notepad, "Kellnerblock") that you can tuck away in a pocket or similar.
The biggest (and most exciting) part of this would (of course) be the projects that further your career (in Starbucks or out of that company) or your personal development.
my $ .02