attempted robbery at my mom's work

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My mom works at a small company & she is there alone most of the time. It isn't in a very good neighborhood either. She actually keeps the door locked most of the time. They have a show room when you walk in the door, then you have to go up about 10 stairs to the office area. My mom heard someone come in the door, so she went to the stairs to greet the man. She said he was sweaty looking. He asked her if they were hiring & she said no. Then he asked to use the phone & again, she said no. Then he said he needed money. She said they don't keep any money there, which is true. He said he left his money in his friend's truck & he really needed to get some money. My mom told him to leave. Then he started like he was going to go up the stairs & my mom said she was going to call the police. The man called her a b!tch & ran out the door. Then people from 2 surrounding businesses came over to see if my mom was ok when they saw the man running from the building. I told my mom that she needs to keep the door there locked all the time. She said they do have some customers that walk in to the office & how could she tell who was suppose to be there for legitimate business & who was there to do harm? Have you ever been robbed while at work?