Hi there, my name is Cameron & I’m a tech expert here with JustAnswer, an independent, paid support website. I know these kinds of things can be really frustrating and I’m sorry you have to deal with this, but I just came across your issue and want to help you as best as I possibly can to try and find a solution! Making sure we can find the best solution or steps forward for you here are my top priorities and I’m reviewing the information you’ve given me now!
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As I said above, I’m very sorry to hear about your issue.
To start, the actions you tried to get this working generally do work! If the issue is smaller and not something that needed repair, these steps you took would work just fine!
However, because they haven't worked and the shutter is still locked up, unfortunately that means there is damage to the sensor most likely. This damage is too much for the sensor to operate, so the camera locks it up as a precaution to prevent further dust or damage. I recommend taking this camera into a local camera shop for some assistance with the repair.