Air carrier flight crew reported experiencing a runway incursion.

Narrative:

We were number three for takeoff on schedule. Third day of a three day trip. Assigned runway xxr. Aircraft ahead was cleared for takeoff; and in a moment of complacency; I taxied across the first hold short line. First indication that I had done it was from the tower controller asking; 'flight abc; where're ya goin'.' we stopped short of the runway xxr second hold short line and we're cleared for takeoff shortly thereafter.cause - simple complacency; loss of situational awareness; and a false sense of comfort. I have flown in and out of ZZZ on xxr many times. I know the hold short lines and their significance at xxr/yy.I should have (and will in the future) emphasized the xxr/yy hotspot more in the departure briefing and should have cultivated more self-awareness during the taxi. I simply followed the aircraft in front of me in a momentary loss of situational awareness.

Original NASA ASRS Text

Title: Air carrier flight crew reported experiencing a runway incursion.

Narrative: We were number three for takeoff on schedule. Third day of a three day trip. Assigned Runway XXR. Aircraft ahead was cleared for takeoff; and in a moment of complacency; I taxied across the first hold short line. First indication that I had done it was from the tower controller asking; 'Flight ABC; where're ya goin'.' We stopped short of the Runway XXR second hold short line and we're cleared for takeoff shortly thereafter.Cause - Simple complacency; loss of situational awareness; and a false sense of comfort. I have flown in and out of ZZZ on XXR many times. I know the hold short lines and their significance at XXR/YY.I should have (and will in the future) emphasized the XXR/YY hotspot more in the departure briefing and should have cultivated more self-awareness during the taxi. I simply followed the aircraft in front of me in a momentary loss of situational awareness.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

Attributes
ACN	1756647
Time
Date	202008
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Aircraft 1
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	Taxi
Flight Plan	IFR
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Person 2
Function	First Officer Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Deviation - Procedural Clearance Ground Incursion Runway