Yes.. the De-icer stuff is counter productive though.. the solvents in it dissolve grease and will carry it out of the lock, so while they melts the ice, they also leave the lock more vulnerable to re-freezing.
I would leave the beast parked out in the sunshine (?) one day, or use a hair-dryer to heat the locks through.
Blast the locks with WD40, using the nozzle, to get any residual moisture out. Let it dry off a bit.
Get some white spray grease and spray that into the locks... working the locks with the key. This will carry the grease into the heart of the lock.
Do it again. Don't neglect the passenger door, since often that's the only way in..
If you have a tub of grease jam the ends of the locks with it, especially if your lock cover flap is worn and doesn't close. The grease will act as a barrier to water getting in.
Use some tyre shine stuff on the door rubbers so that the door doesn't stick to the rubber (if you have a 145, you'll know all about that..