Unlock task sequence in SCCM after console crash

Open SQL Server Studio Management (SSMS), select the Config Manager db and create a new query:

select * from SEDO_LockState where LockStateID <> 0

Execute the query and copy the ID from the output. Then create a new query:

DELETE from SEDO_LockState where LockID = ‘<LockID of the record identified in the previous query>’

Execute the query to delete the lockID.