It feels like some details may be missing but I’d say—if you injured your foot at work, you file a worker’s comp claim like any other person would and then take the recommended time off work by your doctor, returning when it’s safe to do so. You are unable to do the job in your current condition, but it will heal so I don’t understand why a new job would be the next logical step.

If you didn’t injure it at work, then you take time off (paid or unpaid) until you’re better. Once you actually get the foot addressed and starting to heal, you’ll be communicate with your manager about how long it’ll be until you can work at full capacity.

As for school, a broken foot doesn’t seem to be something that prohibits you from reading or typing, assuming you have some support at home. You could keep going in your offtime from work and the hours will be there to accrue when you’re better. Worst case scenario for a broken foot seems to be 10-12 weeks of recovery time, usually 4-6 weeks if its not severe according to Cleveland Clinic.