Try to relax a bit and rejuvenate yourself. Try eating something and allow yourself to enjoy the food - this will give you the energy boost you will need to finish your shift. Also, I suggest only checking your phone once or twice. Don't let yourself become too distracted with what's going on in social media because this can lead you to become distracted. Instead, try listening to a short podcast or read a few pages of a book to keep the mind going.