I Work 9 hr shifts. My feet hurt like a 9/10 pain and my knees cannot be straightened without extreme pain. I need the job but it is unbearable pain.

Go see a foot dr. In person. Reading your post gives us no indication of the biomechanics of your lower extremity. Do not know if you have a low arch, a high arch, etc etc. keep I mind the shoes you wear the support you have are important in a person who stands the whole day. Are you heavy? Are you skinny? All this info is required to help.