Buy 2005 Subaru STI Door Lock Kit. Latch Door (Left, Front). Door Lock Cylinder If your keys don't - OEM Subaru Part # 61031FE030 (61031FE031)

LATCH ASSEMBLY-FRONT DOOR,LEFT Door Lock Kit

Fits Impreza, Outback, STI, WRX

Door Lock Cylinder
If your keys don't turn in your door, you might need to replace the door lock cylinder in your 2005 Subaru STI.