Lock or key may have been switched.
Lock may be rusted or burred. Oil first. Then turn key fully and have someone tap downward on the lock with a screwdriver and a hammer to unjam the lock.
Try turning the key the other way.
The key may be damaged, or the wrong one.
Borrow some large heavy duty bolt cutters, and cut the lock off. Return the bolt cutter and buy a new lock. Cutting bolts require some effort.
Good luck
If the key turns, but the lock doesn't function, then the lock is broken.
Try the key in the trunk lock ...
master key on volkswagen golf 1997 wont open the doors
A key, or a Combonation
You can open a key lock on a door knob, or you can open a deadbolt lock on the door itself.
To open a lock with a key, insert the key into the lock and turn it in the direction that unlocks the mechanism. Make sure the key fits properly and is turned with the correct amount of pressure to successfully unlock the lock.
To open a deadbolt lock, you typically need a key that matches the lock. Insert the key into the lock and turn it clockwise to unlock the deadbolt. If you do not have the key, you may need to contact a locksmith for assistance.
A key in a lock is the thing that turns but never moves.
Some locks can be picked open when you don't have the key. You can use a wire hanger or a hair pin to pick a lock. If you cannot get the lock open, contact a locksmith for help.
It means you put the key in the lock. The plug is the name of the part of a lock cylinder that turns when you turn the key.
If the lock barrel turns, then it's in as far as it needs to go. Otherwise, if the lock barrel doesn't turn, then it's faulty and needs to be replaced. This can unfortunately, sometimes entail replacing the entire Steering Lock Assembly.
Because your key is SEN