$21.00 is a starting wage, They have excellent benefits that is mostly covered by the postal service. They get every holiday off, They have lot's of paid sick leave, A pension, Annual cost of living increases, Low co-pays for medical.
I know my mail carrier works hard, But so do most people around here, And they do it with no paid holidays, No paid sick leave, They have to pay for medical insurance out of their paychecks, And it's a lot of money to pay for family medical insurance yourself. Every place I worked for you didn't get a raise unless you asked for one, And most times you had to let them know you found a higher paying job and were leaving before they would do anything about your pay.
Houses here are very expensive too, I don't know what to say about that other than I am very sorry for the younger folks because it's going to be very tough for them, Much tougher than it was for us. Nobody has had their wages double since covid, Even though everything has doubled in price. When I hear the living wage thing it always makes think of democrat ideals.
Ask the Truck driver, Or the Mechanic, Or the Construction worker about hard work and low pay without benefits. I once went to a Dinner that was put on by the local Fire Department begging for a tax increase, One of the Fireman had the huevos to brag that he was there on overtime, Made me sick to my stomach.
I will have to agree with you that $20.00 is not enough to live on though, What to do about it I don't have an answer for you.