I always wanted to work in TV but it took me two years to get a foot in the door.

我一直想做电视工作，但花了两年才进了这个圈子。

《牛津词典》

The important thing is to get a foot in the door.

最重要的是得先入行。

youdao

The high demand for attractive women will get you a foot in the door.

对于漂亮女性的大量需求能帮你跨进门槛。

youdao

And once they get a foot in the door, everything changes and the takeover begins.

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