"Tomorrow it'll all be over, then I'll have to go back to selling pens again"

In this quote, Johnny Depp is expressing a sense of resignation and dissatisfaction. He is acknowledging that something he has been eagerly anticipating or taking pleasure in will pertain to an end, and he will need to return to an ordinary and maybe unfulfilling job of selling pens. This could be translated as a metaphor for the ups and downs of life, where we have minutes of excitement and joy, however ultimately need to deal with the truth of our obligations and commitments. Depp's words also convey a sense of longing for today moment, as he understands that tomorrow whatever will change.