Buy 2017 Subaru Legacy Sedan Door Latch. Door Lock Kit (Left, Front). Door Lock Cylinder If your keys Cylinder, Don, HANDLE - OEM Subaru Part # 61031SA030

Mechanism to secure door to chassis.

LATCH ASSEMBLY-FRONT DOOR,LEFT Door Lock KitDoor Latch Assembly

Fits Forester

Door Lock Cylinder
If your keys don't turn in your door, you might need to replace the door lock cylinder in your 2017 Subaru Legacy.