“get a foot in the door”不是指“一只脚踏进门里”，真实含义是初步进入（企业或组织）；迈出成功的第一步；获得机会参加。

【例句】
An internship might not sound very interesting, but it's a great way to get your foot in the door at this company.
一个实习的机会听起来没有那么有趣，但是它是你在这个公司迈出成功的第一步。

I always wanted to work at TV station but it took me two years to get a foot in the door.
我一直想在电视台工作，但花了两年才迈出了成功的第一步。