I have a Saab 1990 900S. Can I spray WD-40 in the ignition (where key goes)?

My ignition (where the key goes) is getting hard to turn, and at one point was draining the battery because it was in the wrong position when we turned the car off. What I want to know is, can I spray WD-40 in there to loosen it up, or should I just have it repaired?
 
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