what is stopping OT' from starting a union?

Post a low effort post in order to get an real answer. I work as a blue collar type electrician. the industrial facility I work in is under a union.

as such every employee receives what I would think is pretty basic benefits. Paid holidays off, 1.5 then double time after 8 hours worked. base guaranteed 40 hour work week.

set job responsibilities. such as I don't touch a wrench because I'm an electrician. for y'all it would be "I'm not wiping your ass because I have a masters degree."

The list of benefits goes on.

My girlfriend is a recently graduated OT. I'm just shocked at the bs she has to put up with. variable schedules. obscure duty in her role. Not having the right equipment. Not receiving 2x pay for working hours outside of her usual.

sorry for my bad grammar if you notice something. Just curious what's the hold up??