Police were called to the cemetery after around 60 people were present, ignoring the coronavirus locking.
Dozens of mourners attended the convention at Streetly Crematorium, in the West Midlands, on Saturday Local Democracy Reporting Service the word.
West Midlands police said people were encouraged to disperse but failed to do so and no further action was taken.
Walsall Council said the main gate at the site will now remain locked, with only controlled access given to mourners.
Authorities limit mourners to funerals to 10 people, according to government guidelines.
Ch Supt Andy Parsons, from the West Midlands Police, said: “Unfortunately we cannot encourage mourners to comply with current restrictions and funerals continue to violate new government guidelines issued last week.
“We understand that this is a very troublesome time for families and friends who are grieving but there is a limit on the number of people allowed to attend the funeral to protect everyone from the spread of Covid-19.
“We will only enforce the law as an absolute last resort, but we must stress that these restrictions are imposed to prevent more deaths from this pandemic.”
The council’s portfolio holder for community, leisure and culture, Garry Perry, said staff will manage the crematorium gate starting this week.
“Of course we are aware of the difficulties caused at this time by the restrictions imposed,” he said. “However, the guidelines are clear – the surefire way to defeat the virus is to reduce social contact, stay at home and save lives.”