Mac air won't shut down

Hi,
my mac air suddenly for the first time ever , won't close down. I have a feeling I have opened a dodgy email but not sure, it is from a contact but could be hacked?
On my pc I would use ctl +alt+del to bring up task manager to close dow the pc, is there a similar command for the mac?
Thanks,

Hi, thank you for reply,
sorry but I don't know which is the option key on the mac? (oops). I had tried several times using the power button but that wasn't working either.
the cursor would not open Finder or do anything else, no other programs would open, - just seemed to have frozen, I closed the lid, butit seemd it wasn't even shutting off then, I knew the battery was low, and hey presto this morning, I opened the cover and it was a black screen, not the one previously showing. used the power button, received the battery warning, plugged in main cable, and powered on, and all fine again.
Thanks,

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Message was edited by: beardiebloke

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This is not a reply. I just want to elaborate on this problem.
My computer freezes occasionally when it is used after being sleep for a while. The spinning ball appears and everything is totally disabled. Nothing on the keyboard works.
The mouse moves, but does not work.
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