there is an emergency door unlock switch under the car to the left of the gas tank
This may sound too obvious but if you have the key, unlock it with the key. If not hire a locksmith.
My subaru keys are locked inside. Is there anyway of getting into the car?
Bust down the door
how do you unlock the trunk of a 740il BMW with keys locked inside
Call a locksmith.
On my '02' Expedition the rear actuator went up leaving the door stuck in the locked position, the key nor the key fob would unlock the door. I had to get a locksmith to unlock the door to get the rear panel off then take it in to get the actuator replaced. If this is your problem then if you get a locksmith to unlock the rear door, make sure you take the panel off so you can unlock it from inside.
On the inside of the keyless entry remote or sometimes on the back it explains how to do this. I believe you hold the unlock button along with the lock button for 7 seconds near the car. It will explain it on the inside of the keyless entry remote.
go to a locksmith or use a door code scanner and unlock it.
The easiest way to solve that problem is to call a locksmith to unlock it for you.
Call AAA or break a window.
Break a window or call a locksmith
Check first to see if any of the other doors are unlocked. If no such luck, ask yourself why you locked your key inside...sorry