If the QR is extremely difficult to close, you can just loosened the other end a bit and tried to close again.
You should never use a tool to tighten a QR. It's always hand-tightened. And when I say hand-tightened, doesn't mean you turn blue struggling to close it. Keep in mind the threaded rod holding each end of the QR is relatively thin. You can break it if the QR is too tight and the worst case scenario if it breaks during a ride.
If you're worried about the QR getting loose over time, there is much better, much safer option to zip tie the end to the frame and the fork. If the QR doesn't have a hole at the end of the lever, you can drill a small hole for the zip tie.
I really can't help you find a replacement but hopefully my reply will help prevent another broken QR or getting the QR loose during a ride.