I've struggled with a stiff door lock for weeks, and though some git might have tried to super glue me!!  I tried a squirt of WD40 penetrating oil in the lock key hole with no success, so started to take the door card off, but failed as I couldn't get the window winder handle out. So I eased off the inner window seal on the door capping and gave the lock mechanism a long squirt from every angle with WD40 using the directional tube. It must have knocked off the dust and lubricated everything, like new again!! A 5 minute fix - must do the passenger door as a preventative tomorrow. Cheaper than a broken key in the lock.

ill have to do that on my pass lock tommorow..the key hardly turns it

my drivers door on the other hand lol..u have to turn it to lock then to unlock otherwise it just binds..lol i figure when the lock breaks ill just take off the door =)