Surveillance video shows the woman walking into the Northern California gas station and talking to the clerk inside.
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Savannah Pritchett locks the store's front door and walks the woman towards the restroom, locking her inside and giving her a cell phone to call 911.
Then the clerk lets the alleged kidnappers into the store.
"I knew that if I left the door locked they would have caught on to something and probably took off. So I went back up there, and I unlocked the door. They seriously had no idea that I knew anything," said Pritchett.
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Minutes later, officers storm in with guns drawn and arrested 18-year-old Anthony Sandoval and eventually, three juvenile suspects.
The suspects told police that the victim had been kidnapped a day earlier in Fresno and was sexually assaulted.
The woman is now home safe with her family.