Some pincushions have a little sandbag attached. If you run the rusty needle through that several times, it will be sharpened.
to sharpen edges and make it shiny...
No.
The safety pin has a pin that goes into the head of the pin, and you push the point in or out of the head of the pin.
Ditch the safety pin. Go on eBay, buy a 14g piercing needle that's been packaged in a pouch and sterilized, and do it in one poke.
a safety pin
It is a sewing needle.
First soak your foot in water which will loosen the sink around the glass in your foot. Then use tweezers or safety pin/needle sterilized in alcohol to get it out.
A needle has an "eye" at the other (non-sharp) end, to allow you to pull a thread. A pin doesn't.
safety pin
safety pin
The safety pin was invented to pay off a debt.
The safety pin was rather "inexpensively expensive." Or in other words, The safety pin's value depends on its condition.