How come car rear wheels wont move?

I live in northern Midwest state where it can get cold during winter. Below 0 sometimes

1995 Honda accord

I have not driven it since late January, and now rear wheels wont move. I try to back up and just lurches. I put it in neutral and nothing happens. It is parked on a some what back words slant. Transmission frozen up?

what can I do?
Added (1). If parking brake is stuck, what should I do. The lever is down
Added (2). and wont go forward

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