Death, the grim reaper, is fired from his job and must now do the one thing he has next to no knowledge of ? get a life!
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Oddly enough, as short as this logline is, it uses too many words. If you cut the extra words, you could add a few things that could help the logline.
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Death, the grim reaper (Repetitive, don’t need to say it twice.)
When Death….

is fired from his job (What else are you going to be fire from but a job… so you don’t need to say it)
is fired…

and must now do the one thing he has next to no knowledge of ? get a life!
he must do what he has no knowledge of- get a life!
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“When the death is fired (because of this reason) he has one week to learn the true meaning of life if he’s to get his old job back.”
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Hope that helped, good luck with this!