Why would my car have a Chevy key to it it was the only one that came with it

What is your question?

Now my car won't start at all but the lights all came on but won't start I hear clicking sound from the back fuse box

What makes this problem better or worse?

I don't know but I did change out the low beams bulbs

How long has your 2000 Buick LeSabre had this problem?

It's been 3 days since it last ran