Wiggle the key when inserted - up and down, left-right, here-there, in number 8 pattern...and try to turn it.
IF the ignition lock is indeed worn, see if you can buy used lock set (doors, glove compartment, rear hatch and ignition with keys) and replace the old ones with "new" ones.
If you'd replace only ignition lock, you'll end up with 2 keys - one for doors, another for ignition.
Also, just a side note,: if you keep your ignition key on the key chain with other keys (home, locker, bike, mailbox, etc) those keys will be heavy and will stress the ignition lock. In some make/models that extra weight wears delicate plastic parts in ignition lock and it malfunctions and breaks.
IF the ignition lock is indeed worn, see if you can buy used lock set (doors, glove compartment, rear hatch and ignition with keys) and replace the old ones with "new" ones.
If you'd replace only ignition lock, you'll end up with 2 keys - one for doors, another for ignition.
Also, just a side note,: if you keep your ignition key on the key chain with other keys (home, locker, bike, mailbox, etc) those keys will be heavy and will stress the ignition lock. In some make/models that extra weight wears delicate plastic parts in ignition lock and it malfunctions and breaks.