i can't take a shift, what do i do??
so i've only been working at mcdonalds for two/three months now, and my shift manager had been generally alright. recently, i have been given a date for an important exam at school, since i'm also a student, and the date came out after the week was already closed for unavailability submissions. because of that, i messaged my manager only three days after it was closed and let her know that i would definitely not be available, and that i wasn't able to submit an unavailability because i got my exam date only very recently and didn't make the deadline to submit an unavailability. i got completely ignored, and she scheduled me a shift during my exam anyway. it's not a popular shift, so none of my coworkers are willing to take it, and i don't know many people as i've just started working; is there anything i can do? i don't want to simply not show up, as that'll be unfair to my shift managers, and i don't have time to submit an annual leave request. please advise!!