Usage patterns
〈人〉が戸口に立つto stand at the doorway
She was standing at the doorway waiting for me.
戸口から〈動詞〉to enter/exit through the doorway
The cat quietly came in through the doorway.
戸口で〈人〉を出迎えるto greet someone at the doorway
My family greeted me at the doorway.