car won't start

one of my keys started where it was hard to put in the ignition.  One morning
the car wouldn't start by remote start.  I went to start care and nothing
happened.  the radio and lights worked fine.

I took to auto part store and was told it was the battery and replaced battery.

A few days later the same problem so I used my spare key and the key went
in with no problem but would start.  My auto mechanic neighbor told me to
wiggle the place the key went in.  I had to do this several times before the
car would start.  this has happened several times during the week.  the
problem isn't all the time,