Space Tug

Space Tug is a science fiction story written by Murray Leinster, who was a nom de plume of William Fitzgerald Jenkins, an American writer of science fiction and alternate history literature.

Excerpts from the book:

Joe Kenmore heard the airlock close with a sickening wheeze and then a clank. In desperation he turned toward Haney. "My God, we've been locked out!". Through the transparent domes of their space helmets, Joe could see a look of horror and disbelief pass across Haney's face. But it was true! Joe and his crew were locked out of the Space Platform.