Is it legal for my boss to tell me upon hiring me that I am not allowed to take deliveries past dark but  and now require me to?

Question Details:

When I first got my job, my boss told me that I would never go on deliveries after dark because I am a girl; he told me it was too risky to send me out past dark. He told me the guys will take all deliveries after dark. The first few months, I didn't take any deliveries. Then I started getting trained to do deliveries. Now, I am the main delivery girl but for no extra pay. He compensates me $1 per delivery. I also take all deliveries whether its dark or not. Last night I was out until 10 pm doing deliveries. This happens almost every night.

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