BlackTowel wrote:There's a little plastic cover on the front and when I open it there's a round thing which I can turn arount.
If that's something that closes the battery lid, you might want to try a little bit if you find a way to turn it (or whatever movement is required)
If that round thing is silver-colored and looks like it accepts a round key, use the search function for "tubular" locks.
If it's a round hole, and you see a + shaped keyway behind it, search for "cruciform" locks.
Or just post a picture.
(And don't expect help here about how to open a high security vault)
