If you are contracted to only work certain hours or are paid hourly then you too have the option to not work for free! I set my desk number to send calls straight to voicemail after 5pm and ignore my emails. Whatever it is can wait until the morning.

I'm hourly. They pay me or I don't work.

My job is actually really good about that though. My boss called me on my personal phone because they couldn't get into an account that I set the password on. I fixed it in like 5 minutes and he put me on the clock for 15 to make it worth bothering me on my day off.