UniFirst review: Employment

My name is Peter Desroches I am a disabled worker. I had worked at unifirst in stockton california as a janitor. In january thursday 7th I was fired at unifirst in stockton california. I was told to go home from my work work supervisor because I was having problems with wearing mask over my face to ware I could not cover my nose. I could of sworn I was fired? I came to that conclusion after I was told if I can't wear a mask fully over my nose then I can't be there. That means I was fired, so that same day I filed a complaint here and called hr and go figure left a voicemail for some fake hr legal representative. I said in my voicemail im looking into legal options if I can't get rehired. I also wanted to know my legal rights and more information on alternative mask wearing to enter the workplace. I never received an answer. Anyway 3 days later I returned to get my termination paperwork. I was then told by hr there that I wasn't fired? I then seen management and the plant manager close the conference door while I was talking to an hr employee. I was told to wait outside of the office. Minutes later I was then told by hr there that I can come back the next day on the 12th of january.
I came back thinking oh good I still have a job.. Nope instead I was then told I was suspended for 3 more days because of work performance regarding covid maintenance paperwork I have to fill out every day. I had to fill it out and do extra work like wipe down the entire plant with cleaner. I did that despite not having enough time in the day, this affected my health because im disabled. So I had forgotten to fill out the paperwork checklist regarding the daily wipe downs.
Its funny how management and hr cleverly used this job violation against me after I filed a discrimination report and i'm called unifirst human resources. This is harassment, discrimination and poor management as far as not providing an extra custodian to take care of this covid situation. Also I was never informed of any alternatives to mask wareing. Under federal law the disabled who can prove wearing a mask is harmful to them dont have to. Also an alternative must be provided at work places. The fact that unifirst believes they have the right terminate a disabled employee because I retaliated is down right illegal. Also in my employment contract there was never any mention of covid maintenance. Another fact there was me and still is another custodian there. Management had pretty much made my work load not even to hers. I had to collect all of the 100s of 1bs of trash which filled up four service carts a day past my head! I had to sweep up literally massive lots of garbage most of the time. I had to clean common areas like the stockroom. I had to clean piles of garbage left by employees and drivers outside. I had to collect pallets and remove them by hand outside because there was no room to use a pallet jack most of the time. Then if that wasn't enough uneven workload, I had to wipe down the entire plant! The other custodian only half way cleaned the production plant then spend most of her day inside the office cleaning. She was hired long before I arrived there. The disabled have rights an no one cares. This has to be illegal?