When you use AddPropForce it applies the force to the entire object as a whole. The cabinet is static aside from the doors, so using AddPropForce won't work the way you want. Instead, you'll want to use these two functions. Instead of applying the force to the whole prop, it applies it to specific bodies, in this case the two cabinet doors.
AddBodyImpulse("cabinet_nice_1_Body_1", fX, fY, fZ, "World");
AddBodyImpulse("cabinet_nice_1_Body_2", fX, fY, fZ, "World");
As usual, make sure you tweak the X, Y and Z forces until the cabinet doors open the way you want them to.