A Flight Attendant in Charge reports about the difficulty closing the Left L-1 forward cabin entry Door on a B737-800 aircraft. Three to five minutes into the flight; wind noise could be heard coming from the Door. Noise was also coming from the Right R-1 door. Aircraft returned to field and Maintenance re-rigged the L-1 door.

Narrative

[After boarding] I closed the Left L-1 Door. It took three trys to successfully push the [Door] handle down. About 3-5 minutes into the flight; you heard wind noise coming from the door. There was also some noise coming from the Right R-1 Door; I immediately notified the Mechanic. He tried to use a blanket to stop the noise and went into the cockpit to notify the Pilots. We turned around and went back to ZZZ. After about an hour; the Mechanic opened/closed the front door four times before it finally engaged where he could push the handle down. I asked him if he would have the ground personnel [check] that the flap at the bottom of the door closed. He said that it was closed. We took off again; there was no cockpit light indicating that there was a problem with the door. There was a rigging problem with the door. The B737-800 went into Maintenance and the door was re-rigged. An additional switch was put in. A Company Bulletin to increase crewmember awareness was issued to prevent future problems. Information is reviewed during training.