Canon 450d Shutter button problem

I just want to ask kung meron ng naka experience like my problem,

I was taking a picture of a dark room kanina, as in pitch black, then nahirapan autofocus ng camera so I press the shutter button quite hard to take the picture, pero ayaw pa rin,

after that, parang lumubog yung shutter button ko, dahil siguro sa hard press ko, it still works but you really have to press it hard, nagka problem na din ba kayo like mine? balak kong dalhin sa service center camera ko next week pero tanungin ko na kayo in advance kasi baka meron na naka experience nito, how much umabot ang repair?

nakaexperience na ako ng ganyan bro. sa dark ko din nagamit. pero hindi hard press yung nangyari sa akin, parang stuck lang, ayaw magfocus, pero after, bumalik sa normal.

I think kailangan mo ipatingin yan sa service center, dalhin mo sa mckinley hill bro, sa may the fort. para mas mabilis, kasi dun na ang main branch nila.