The most likely cause is user error. Try hitting Esc before typing one of the exit commands listed above (e.g. ":wq"). Be sure to type the colon, as it is a necessary part of the exit command.

In the rare event that vim is frozen or unresponsive, it may be necessary to forcefully kill it. Assuming you are on a Linux system, this can typically be accomplished by executing the command "pkill vim" in another console window. This can be made even more forceful by adding the "-9" command line flag (e.g. "pkill -9 vim"). Note that killing vim will cause you to loose any unsaved work, and is relatively inconvenient to do, so it should be used as a last resort.
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