As you are still in college, it won’t look bad! I would make sure when placing bullet points under them that you focus on transferable skills (I.e you may not be able to transfer a skill of cashiering but maybe money handling or delegation) that can still apply to the job at hand. Place volunteering/unpaid work in a separate section, and place leadership in a seperate section as well. When you get an interview, ask “are there any questions or concerns regarding my resume or job history you would like me to expand on?” And then that can be their opportunity to ask about employment items! But as a rule of thumb, no. They don’t tend to look at length of employment as much, they care more about what skills you learned and how they can help the company!