An agent out on a routine call was left terrified by a car-jacking incident in which the assailants wore balaclavas.
She was ordered out of her Audi, which was driven away and has not been recovered.
The judge, sentencing the two teenagers who carried out the crime, said the agent was in fear of now doing the job and no longer showed tenants round properties.
The terrifying incident happened in February, Bradford Crown Court heard.
The agent had gone to meet a tenant but after she wound down her window, one of the 16-year-olds leaned in and grabbed the car keys.
After a struggle, the agent got out of the car and he got into the driving seat.
CCTV showed the Audi, worth some £40,000, being driven away in convoy with a BMW thought to have been used to get to the scene and which had been stolen the day before.
The pair were arrested two days later and a mobile phone which was recovered had a video clip from a social media post, showing one of the two driving the stolen Audi.
Judge Rose sentenced one of the youths to three years’ detention and the other to 18 months.
The judge said of the unnamed agent: “She was vulnerable by being alone, by reason of her gender, and because she was sitting down. You gave her no opportunity to make an escape or avoid what was coming.
“It isn’t just about the car. It’s the fear that she can no longer do the job because of the fear that it would happen again.”