Are you trying to open it with the key or the boot release thing under the seats?
Don't know the Mazda model, but thinking it may be like some of the SV21 camrys, the boot key lock of them had two positions, one would not let the release inside the car to work, for added boot security... you had to turn the key with the boot shut to do this though...
Just a thought...
Cheers
Vanman
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