I have a 2003 Chrysler Sebring Convertible and the key will not turn in the ignition

Tim, sounds like tumblers in ignition may be sticking or your keys cut worn out, put key in ignition and hit end of key sharply/some force with a small hammer, wrench, screw driver handle what ever you have, try turning key.
If this dose not do it call a good locksmith, they are cheape then the dealer.
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1999 Chrysler Sebring Convertible, Ignition Coil in ...

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Jan 31, 2011 - Uploaded by syyenergy7
Ignition Coil in Gen I distributor, Chrysler Sebring convertible. ... I have a 1997 Sebring Convertible and it has the 2.5v6. .....Some reason I thought this was about replacing the cam position sensor, now I realize it's actually the ...

On mine, after battery disconnected, I had to have the key in the ignition and turned to on when connecting the battery.

have you tried a spare key ? Is the steering under strain - turned to the far right or left ?

Start testing the lighting circuits with a ohm meter for shorts. Sometimes it's impossible to get to the wires without taking the entire car apart. Never do this, instead find a good part of the circuit with your ohm meter
and make a connection there with a new wire.
More common is switch issues or loose connectors.
Obtain a shop manual for your model and refer to the electrical parts section.
Don't worry about the cost of the shop manual, it will pay for itself.

Leaving the key in the ignition turns on the computers in the car. If you have had hard starts this may cause it.

Go to the dealer with the VIN and they can cut a new key to fit the original cylinder.

Have your charging system checked. I had a similar problem with a chrysler van - the lights would brighten and then dim periodically. it turned out to be the battery.

goto your local Chrysler dealer silly!

Try removing the alarm system relay, some car alarm has also a fuse on the alarm that you can remove.
Many car alarms unlock by inserting and turning car key while you connect the battery.