2000 ZX2 Brake-Shift Interlock

I have a 2000 ZX2 and the brake-shift interlock won't engage and let the car out of park.If you sit and press the brake repeatedly it will finally
release but only after quite some time. I had this same problem with this car earlier this year but it stopped all at once and worked fine. It just started doing it again last week. Any ideas?
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