Sliding Window Latches

Just moved into a house built in 1986. It has horizontal sliding windows with a single lever latch in the center. The windows halves do not close 100% and the latch is very difficult to "lock". You have to really push hard in the window to close them in order to latch it. There is nothing in the vertical window track, nor nothing that seems to be in the way of them closing. Probable just some swelling with age, etc. Question is...Is it advisable to plane off a little off the ends until the latch catches easily. Or are there some other ideas out there. (Shimming the latch half outward with washers??? Might not look right)
Thanks in advance. Bg
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