starting trouble immobiliser,VW Transporter ?

i took my van to the mechanic and he sorted the handbrake cable and put in new brake pads , i went paid him took it home and parked it up.

next day it wouldn't start as before , the lights would all come on but on turning the key further to start, nothing,... that is for about 7/8 times, then it started.

i took it to another mechanic who looked at it and came to the conclusion it is the ignition switch under the barrel which isn't making a connection.

when the key is turned with a bit of force the van starts ok.

is this the correct diagnosis or is he wrong??