This used to be very common. There are two things to look at (any one can look at)
Kneel on the floor LHD side and look up the handbrake handle. There is a switch that SHOULD be pressing on the lever. As simple as that.
1) The bolt/screw holding the switch has come loose.
2) The bracket the switch is on has got bent so the two do not align
So tighten the bolt/screw and bend the bracket to line the switch with the arm. Really simple.