name their posts please

[kwokwai]

typically, before you can watch a movie in a cinema, you have to buy a ticket. After that, your ticket will be checked if it is valid before you can enter the movie room.

Please name the job name of these two posts:
1. The person who sells tickets in cinema.
2. The person who's responsible for checking the validity of the ticket.

I am writing a resume' in English for a friend, and her working experience includes the above two posts.
What makes me feeling frustrated is that I just don't know
the correct English name for the two jobs.

Please help!