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Well hi there, welcome to the community! There's tons of great information and great people around here.
I wouldn't worry too much about something being broken as the cause for the button being stuck- when I picked up my e90 a few of the HVAC controls were also stuck, I assume from not being pressed in forever and heat cycling in the sun, and it took a bit of massaging to free them up... a year later and there are no issues with them whatsoever.
I'd press light/mildly around each corner of the button, sort of rocking it around. It may also help to try it under a bunch of different conditions, like when the interior is hot or cold, in hopes of freeing it up.
As long as you're not absolutely pounding on it, it shouldn't break, but I'm having a hard time coming up with some sort of metric as to how much is too much, and that definitely varies by person so keep that in mind.
It's possible something sticky has gotten in there and froze the button up, but we'll see.
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