The first sentence is rather flat, but this example (like nearly every one I use) originated as a writing prompt found on Pinterest, and I don’t expect brilliant narrative voice from those (although competent punctuation and grammar would be nice to see more often). At any rate, there are no errors in the first sentence.
However, the second sentence needs — nay, requires — a comma after said, a period instead of a comma after this, and a period (inside the quotation marks) after here.
I woke up to find a group of men with guns had entered my house.
One of them handed me a pistol and said, “You’ll need this. They’re almost here.”